plex-playlist/.gitea/workflows/docker-build-base.yaml

name: Docker Build Base

on:
  workflow_dispatch:
    inputs:
      force_rebuild:
        description: Force a rebuild even when the immutable base tag already exists
        required: false
        default: "false"
      head_sha:
        description: Commit SHA to process
        required: false
      source_workflow:
        description: Upstream workflow name
        required: false
      trace_id:
        description: Correlation id propagated across CICD dispatch chain
        required: false

concurrency:
  group: base-${{ github.sha }}
  cancel-in-progress: true

env:
  GITEA_SSH_HOST: kankali.darkhelm.lan
  GITEA_SSH_PORT: "2222"
  GITEA_REPO_SSH_URL: ssh://git@kankali.darkhelm.lan:2222/DarkHelm.org/plex-playlist.git
  GITEA_REGISTRY: kankali.darkhelm.lan:3001
  GITEA_REGISTRY_IP: 10.18.75.2
  GITEA_REGISTRY_HOST: kankali.darkhelm.lan

defaults:
  run:
    shell: bash

jobs:
  publish-base:
    name: Build and Publish CICD Base Image
    # Use ubuntu-act runner pool which is known to be available.
    runs-on: ubuntu-act
    timeout-minutes: 35
    outputs:
      base_hash: ${{ steps.base-state.outputs.base_hash }}
      head_sha: ${{ steps.meta.outputs.head_sha }}

    steps:
      - name: Identify runner
        run: |
          echo "=== Runner Identity ==="
          echo "runner_name=${RUNNER_NAME:-}"
          echo "runner_name_hint=${GITEA_RUNNER_NAME:-${ACT_RUNNER_NAME:-${RUNNER_NAME:-unknown}}}"
          echo "runner_hostname_env=${HOSTNAME:-unknown}"
          echo "runner_uname_n=$(uname -n 2>/dev/null || echo unknown)"
          echo "runner_etc_hostname=$(cat /etc/hostname 2>/dev/null || echo unknown)"
          echo "runner_os=${RUNNER_OS:-unknown}"
          echo "runner_arch=${RUNNER_ARCH:-unknown}"
          echo "timestamp_utc=$(date -u +%Y-%m-%dT%H:%M:%SZ)"

      - name: Emit startup diagnostics
        shell: sh
        env:
          EVENT_NAME: ${{ github.event_name }}
          SOURCE_WORKFLOW: ${{ github.event.inputs.source_workflow }}
          FORCE_REBUILD: ${{ github.event.inputs.force_rebuild }}
          TRACE_ID_INPUT: ${{ github.event.inputs.trace_id }}
          HEAD_SHA_INPUT: ${{ github.event.inputs.head_sha }}
          HEAD_SHA_FALLBACK: ${{ github.sha }}
          REF: ${{ github.ref }}
          REF_NAME: ${{ github.ref_name }}
          HEAD_REF: ${{ github.head_ref }}
          TARGET_LABEL: ubuntu-act
        run: |
          RESOLVED_HEAD_SHA="${HEAD_SHA_INPUT:-${HEAD_SHA_FALLBACK}}"
          TRACE_SUFFIX="$(printf '%s' "${RESOLVED_HEAD_SHA}" | cut -c1-8)"
          TRACE_ID="${TRACE_ID_INPUT:-cicd-base-${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT}-${TRACE_SUFFIX}}"
          echo "=== Base Workflow Startup Audit ==="
          echo "event_name=${EVENT_NAME}"
          echo "source_workflow=${SOURCE_WORKFLOW}"
          echo "force_rebuild=${FORCE_REBUILD}"
          echo "head_sha_input=${HEAD_SHA_INPUT}"
          echo "head_sha=${RESOLVED_HEAD_SHA}"
          echo "ref=${REF}"
          echo "ref_name=${REF_NAME}"
          echo "head_ref=${HEAD_REF}"
          echo "trace_id=${TRACE_ID}"
          echo "target_runner_label=${TARGET_LABEL}"
          echo "timestamp_utc=$(date -u +%Y-%m-%dT%H:%M:%SZ)"
          echo "startup_audit=ok"

      - name: Preflight Docker and registry connectivity
        env:
          PACKAGE_ACCESS_TOKEN: ${{ secrets.PACKAGE_ACCESS_TOKEN }}
          REGISTRY_USER: ${{ github.actor }}
        run: |
          set -e
          if ! grep -q "${GITEA_REGISTRY_HOST}" /etc/hosts; then
            echo "${GITEA_REGISTRY_IP} ${GITEA_REGISTRY_HOST}" >> /etc/hosts
          fi

          echo "=== Docker Preflight ==="
          command -v docker
          docker --version
          docker info >/tmp/docker-info.log 2>&1 || (echo "❌ docker info failed" && tail -n 40 /tmp/docker-info.log && exit 1)
          grep -qi "${GITEA_REGISTRY}" /tmp/docker-info.log || echo "⚠ Registry not listed in docker info insecure registries: ${GITEA_REGISTRY}"

          echo "=== Registry Login Preflight ==="
          if [ -z "${PACKAGE_ACCESS_TOKEN}" ]; then
            echo "❌ PACKAGE_ACCESS_TOKEN is empty"
            exit 1
          fi
          echo "${PACKAGE_ACCESS_TOKEN}" | docker login "http://${GITEA_REGISTRY}" -u "${REGISTRY_USER}" --password-stdin >/tmp/docker-login.log 2>&1 || (echo "❌ Registry login preflight failed" && tail -n 40 /tmp/docker-login.log && exit 1)
          echo "registry_login_preflight=ok"

      - name: Audit trigger context
        env:
          EVENT_NAME: ${{ github.event_name }}
          SOURCE_WORKFLOW: ${{ github.event.inputs.source_workflow }}
          FORCE_REBUILD: ${{ github.event.inputs.force_rebuild }}
          TRACE_ID_INPUT: ${{ github.event.inputs.trace_id }}
          HEAD_SHA_INPUT: ${{ github.event.inputs.head_sha }}
          HEAD_SHA_FALLBACK: ${{ github.sha }}
          REF: ${{ github.ref }}
          REF_NAME: ${{ github.ref_name }}
          HEAD_REF: ${{ github.head_ref }}
        run: |
          RESOLVED_HEAD_SHA="${HEAD_SHA_INPUT:-${HEAD_SHA_FALLBACK}}"
          TRACE_ID="${TRACE_ID_INPUT:-cicd-base-${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT}-${RESOLVED_HEAD_SHA:0:8}}"
          echo "=== Dispatch Audit: CICD Base Image ==="
          echo "event_name=${EVENT_NAME}"
          echo "source_workflow=${SOURCE_WORKFLOW}"
          echo "force_rebuild=${FORCE_REBUILD}"
          echo "head_sha_input=${HEAD_SHA_INPUT}"
          echo "head_sha=${RESOLVED_HEAD_SHA}"
          echo "ref=${REF}"
          echo "ref_name=${REF_NAME}"
          echo "head_ref=${HEAD_REF}"
          echo "trace_id=${TRACE_ID}"

      - name: Resolve head SHA
        id: meta
        env:
          HEAD_SHA_INPUT: ${{ github.event.inputs.head_sha }}
          HEAD_SHA_FALLBACK: ${{ github.sha }}
        run: |
          RESOLVED_HEAD_SHA="${HEAD_SHA_INPUT:-${HEAD_SHA_FALLBACK}}"
          echo "head_sha=${RESOLVED_HEAD_SHA}" >> "$GITHUB_OUTPUT"

      - name: Minimal checkout for base inputs
        env:
          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
          GITHUB_SHA: ${{ steps.meta.outputs.head_sha }}
        run: |
          umask 077
          trap 'rm -f ~/.ssh/id_rsa' EXIT
          echo "=== Minimal Repository Checkout for Base Inputs ==="

          if ! grep -q "${GITEA_REGISTRY_HOST}" /etc/hosts; then
            echo "${GITEA_REGISTRY_IP} ${GITEA_REGISTRY_HOST}" >> /etc/hosts
          fi

          if [ -n "${SSH_PRIVATE_KEY}" ]; then
            mkdir -p ~/.ssh
            echo "${SSH_PRIVATE_KEY}" > ~/.ssh/id_rsa
            chmod 600 ~/.ssh/id_rsa
            echo "Loaded SSH key fingerprint: $(ssh-keygen -lf ~/.ssh/id_rsa | awk '{print $2}')"
            ssh-keyscan -p "${GITEA_SSH_PORT}" "${GITEA_SSH_HOST}" >> ~/.ssh/known_hosts 2>/dev/null
          else
            echo "❌ SSH_PRIVATE_KEY is empty"
            exit 1
          fi

          GIT_SSH_COMMAND="ssh -i ~/.ssh/id_rsa -o IdentitiesOnly=yes -o StrictHostKeyChecking=no" \
            git clone --depth 1 --no-checkout \
            "${GITEA_REPO_SSH_URL}" .

          if [ -n "${GITHUB_SHA}" ] && \
             GIT_SSH_COMMAND="ssh -i ~/.ssh/id_rsa -o IdentitiesOnly=yes -o StrictHostKeyChecking=no" \
             git fetch --depth 1 origin "${GITHUB_SHA}" >/dev/null 2>&1; then
            git checkout FETCH_HEAD -- Dockerfile.cicd-base .dockerignore scripts/compute-cicd-base-hash.sh
            echo "✓ Checked out base inputs from commit ${GITHUB_SHA}"
          else
            git checkout HEAD -- Dockerfile.cicd-base .dockerignore scripts/compute-cicd-base-hash.sh
            echo "⚠ Falling back to default branch HEAD for base inputs checkout"
          fi

          chmod +x scripts/compute-cicd-base-hash.sh
          rm -f ~/.ssh/id_rsa

      - name: Compute base hash and inspect registry
        id: base-state
        env:
          PACKAGE_ACCESS_TOKEN: ${{ secrets.PACKAGE_ACCESS_TOKEN }}
          REGISTRY_USER: ${{ github.actor }}
          FORCE_REBUILD: ${{ github.event.inputs.force_rebuild }}
        run: |
          echo "=== Computing CICD Base Image Hash ==="

          BASE_HASH=$(./scripts/compute-cicd-base-hash.sh)
          BASE_REF_HASH="${GITEA_REGISTRY}/darkhelm.org/plex-playlist-cicd-base:${BASE_HASH}"
          BASE_REF_LATEST="${GITEA_REGISTRY}/darkhelm.org/plex-playlist-cicd-base:latest"

          echo "Base hash: ${BASE_HASH}"
          echo "base_hash=${BASE_HASH}" >> $GITHUB_OUTPUT
          echo "base_ref_hash=${BASE_REF_HASH}" >> $GITHUB_OUTPUT
          echo "base_ref_latest=${BASE_REF_LATEST}" >> $GITHUB_OUTPUT

          if ! grep -q "${GITEA_REGISTRY_HOST}" /etc/hosts; then
            echo "${GITEA_REGISTRY_IP} ${GITEA_REGISTRY_HOST}" >> /etc/hosts
          fi

          if ! echo "${PACKAGE_ACCESS_TOKEN}" | docker login "http://${GITEA_REGISTRY}" -u "${REGISTRY_USER}" --password-stdin >/dev/null 2>&1; then
            echo "❌ Registry login failed during base inspection"
            exit 1
          fi

          if [ "${FORCE_REBUILD}" = "true" ]; then
            echo "Manual force rebuild requested"
            echo "needs_build=true" >> $GITHUB_OUTPUT
            exit 0
          fi

          for i in 1 2 3; do
            echo "Existing base check ${i}/3 for ${BASE_REF_HASH}..."
            # Manifest inspect is unreliable on some runners; use pull as truth.
            if timeout 900 docker pull "${BASE_REF_HASH}" >/tmp/base-state-pull.log 2>&1; then
              echo "✓ Immutable base image already exists and is pullable: ${BASE_REF_HASH}"
              echo "needs_build=false" >> $GITHUB_OUTPUT
              exit 0
            else
              pull_exit=$?
              echo "Existing base pull check failed with exit code ${pull_exit}"
              if [ "${pull_exit}" -eq 124 ]; then
                echo "Existing base pull timed out after 900s"
              fi
              if [ -s /tmp/base-state-pull.log ]; then
                tail -n 20 /tmp/base-state-pull.log || true
              fi
            fi

            if [ "${i}" -lt 3 ]; then
              sleep 10
            fi
          done

          echo "ℹ Immutable base image missing or not yet pullable: ${BASE_REF_HASH}"
          echo "needs_build=true" >> $GITHUB_OUTPUT

      - name: Write registry push helpers
        run: |
          cat > /tmp/registry-push-helpers.sh <<'EOF'
          #!/bin/bash

          ensure_skopeo() {
            if command -v skopeo >/dev/null 2>&1; then
              return 0
            fi

            if command -v apt-get >/dev/null 2>&1; then
              apt-get update && apt-get install -y skopeo
            elif command -v apk >/dev/null 2>&1; then
              apk add --no-cache skopeo
            fi

            if ! command -v skopeo >/dev/null 2>&1; then
              echo "❌ skopeo not available for fallback push"
              return 1
            fi
          }

          push_ref_with_fallback() {
            ref="$1"
            local_image="$2"
            archive_path="$3"
            registry_user="$4"
            package_access_token="$5"

            for i in 1 2 3; do
              echo "Docker push attempt ${i}/3 for ${ref}..."
              if docker push "${ref}"; then
                echo "✓ Docker push succeeded for ${ref}"
                return 0
              fi

              if [ "${i}" -lt 3 ]; then
                sleep 10
              fi
            done

            echo "⚠ Docker push failed for ${ref}; trying skopeo fallback"

            if ! ensure_skopeo; then
              return 1
            fi

            if [ ! -f "${archive_path}" ]; then
              echo "Creating local image archive for fallback push..."
              if ! docker save "${local_image}" -o "${archive_path}"; then
                echo "❌ Failed to create docker archive for fallback push"
                return 1
              fi
            fi

            if skopeo copy \
                --dest-creds "${registry_user}:${package_access_token}" \
                --dest-tls-verify=false \
                "docker-archive:${archive_path}" \
                "docker://${ref}"; then
              echo "✓ Skopeo fallback push succeeded for ${ref}"
              return 0
            fi

            echo "❌ Skopeo fallback push failed for ${ref}"
            return 1
          }
          EOF

          chmod 700 /tmp/registry-push-helpers.sh

      - name: Build and push base image
        if: steps.base-state.outputs.needs_build == 'true'
        env:
          PACKAGE_ACCESS_TOKEN: ${{ secrets.PACKAGE_ACCESS_TOKEN }}
          REGISTRY_USER: ${{ github.actor }}
          BASE_HASH: ${{ steps.base-state.outputs.base_hash }}
          BASE_REF_HASH: ${{ steps.base-state.outputs.base_ref_hash }}
          BASE_REF_LATEST: ${{ steps.base-state.outputs.base_ref_latest }}
        run: |
          echo "=== Building CICD Base Image ==="

          if ! grep -q "${GITEA_REGISTRY_HOST}" /etc/hosts; then
            echo "${GITEA_REGISTRY_IP} ${GITEA_REGISTRY_HOST}" >> /etc/hosts
          fi

          if ! echo "${PACKAGE_ACCESS_TOKEN}" | docker login "http://${GITEA_REGISTRY}" -u "${REGISTRY_USER}" --password-stdin; then
            echo "❌ Registry login failed before build"
            exit 1
          fi

          PLAYWRIGHT_BROWSERS_MIRROR_TAG="${GITEA_REGISTRY}/darkhelm.org/playwright-browsers:v1.56.1-jammy"
          echo "playwright_browsers_mirror_tag=${PLAYWRIGHT_BROWSERS_MIRROR_TAG}"

          if ! docker pull "${PLAYWRIGHT_BROWSERS_MIRROR_TAG}" >/tmp/playwright-mirror-pull.log 2>&1; then
            echo "❌ Required internal Playwright browsers mirror image is missing: ${PLAYWRIGHT_BROWSERS_MIRROR_TAG}"
            echo "Mirror this image into your internal registry before running base builds."
            tail -n 80 /tmp/playwright-mirror-pull.log || true
            exit 1
          fi

          PLAYWRIGHT_BROWSERS_IMAGE=$(docker image inspect --format='{{index .RepoDigests 0}}' "${PLAYWRIGHT_BROWSERS_MIRROR_TAG}" 2>/dev/null || true)
          if [ -z "${PLAYWRIGHT_BROWSERS_IMAGE}" ]; then
            echo "❌ Failed to resolve immutable digest for ${PLAYWRIGHT_BROWSERS_MIRROR_TAG}"
            exit 1
          fi

          echo "playwright_browsers_image=${PLAYWRIGHT_BROWSERS_IMAGE}"

          export DOCKER_BUILDKIT=1

          BUILD_TIMEOUT_SECONDS=5400
          BUILD_START_EPOCH=$(date +%s)
          echo "docker_build_timeout_seconds=${BUILD_TIMEOUT_SECONDS}"
          echo "docker_build_started_utc=$(date -u +%Y-%m-%dT%H:%M:%SZ)"

          timeout "${BUILD_TIMEOUT_SECONDS}" docker build --progress=plain -f Dockerfile.cicd-base \
            --build-arg BASE_IMAGE_VERSION="v1.0.0-${BASE_HASH}" \
            --build-arg BASE_IMAGE_HASH="${BASE_HASH}" \
            --build-arg PLAYWRIGHT_BROWSERS_IMAGE="${PLAYWRIGHT_BROWSERS_IMAGE}" \
            -t cicd-base:latest .
          BUILD_EXIT_CODE=$?
          if [ "${BUILD_EXIT_CODE}" -ne 0 ]; then
            if [ "${BUILD_EXIT_CODE}" -eq 124 ]; then
              echo "❌ docker build timed out after ${BUILD_TIMEOUT_SECONDS}s"
            else
              echo "❌ docker build failed with exit code ${BUILD_EXIT_CODE}"
            fi
            exit "${BUILD_EXIT_CODE}"
          fi

          BUILD_END_EPOCH=$(date +%s)
          BUILD_ELAPSED=$((BUILD_END_EPOCH - BUILD_START_EPOCH))
          echo "docker_build_elapsed_seconds=${BUILD_ELAPSED}"

          ARCHIVE_PATH="/tmp/cicd-base.tar"
          source /tmp/registry-push-helpers.sh

          docker tag cicd-base:latest "${BASE_REF_HASH}"
          docker tag cicd-base:latest "${BASE_REF_LATEST}"

          push_ref_with_fallback "${BASE_REF_HASH}" "cicd-base:latest" "${ARCHIVE_PATH}" "${REGISTRY_USER}" "${PACKAGE_ACCESS_TOKEN}"
          push_ref_with_fallback "${BASE_REF_LATEST}" "cicd-base:latest" "${ARCHIVE_PATH}" "${REGISTRY_USER}" "${PACKAGE_ACCESS_TOKEN}"

      - name: Verify published base image
        env:
          PACKAGE_ACCESS_TOKEN: ${{ secrets.PACKAGE_ACCESS_TOKEN }}
          REGISTRY_USER: ${{ github.actor }}
          BASE_REF_HASH: ${{ steps.base-state.outputs.base_ref_hash }}
        run: |
          echo "=== Verifying Published CICD Base Image ==="

          if ! grep -q "${GITEA_REGISTRY_HOST}" /etc/hosts; then
            echo "${GITEA_REGISTRY_IP} ${GITEA_REGISTRY_HOST}" >> /etc/hosts
          fi

          if ! echo "${PACKAGE_ACCESS_TOKEN}" | docker login "http://${GITEA_REGISTRY}" -u "${REGISTRY_USER}" --password-stdin; then
            echo "❌ Registry login failed during verification"
            exit 1
          fi

          for i in 1 2 3 4 5 6; do
            echo "Verification attempt ${i}/6 for ${BASE_REF_HASH}..."

            if docker pull "${BASE_REF_HASH}"; then
              echo "✓ Published base image is pullable: ${BASE_REF_HASH}"
              exit 0
            fi

            if [ "${i}" -lt 6 ]; then
              echo "⚠ Pull failed; waiting 20s before retry"
              sleep 20
            fi
          done

          echo "❌ Published base image could not be pulled after 6 attempts: ${BASE_REF_HASH}"
          exit 1

      - name: Dispatch main build workflow
        env:
          ACTIONS_TRIGGER_TOKEN: ${{ secrets.ACTIONS_TRIGGER_TOKEN }}
          PACKAGE_ACCESS_TOKEN: ${{ secrets.PACKAGE_ACCESS_TOKEN }}
          HEAD_SHA: ${{ steps.meta.outputs.head_sha }}
          BASE_HASH: ${{ steps.base-state.outputs.base_hash }}
          REPO_FULL: ${{ github.repository }}
          HEAD_REF: ${{ github.head_ref }}
          REF_NAME: ${{ github.ref_name }}
          TRACE_ID_INPUT: ${{ github.event.inputs.trace_id }}
        run: |
          set -e

          DISPATCH_TOKEN="${ACTIONS_TRIGGER_TOKEN:-${PACKAGE_ACCESS_TOKEN:-}}"

          if [ -z "${DISPATCH_TOKEN}" ]; then
            echo "❌ Missing dispatch token. Set ACTIONS_TRIGGER_TOKEN (repo write scope) or ensure PACKAGE_ACCESS_TOKEN has Actions workflow-dispatch permissions."
            exit 1
          fi

          if ! grep -q "${GITEA_REGISTRY_HOST}" /etc/hosts; then
            echo "${GITEA_REGISTRY_IP} ${GITEA_REGISTRY_HOST}" >> /etc/hosts
          fi

          REPO_OWNER="${REPO_FULL%/*}"
          REPO_NAME="${REPO_FULL#*/}"
          TARGET_REF="${HEAD_REF:-${REF_NAME}}"
          TRACE_ID="${TRACE_ID_INPUT:-cicd-base-${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT}-${HEAD_SHA:0:8}}"

          echo "trace_id=${TRACE_ID}"
          echo "target_ref=${TARGET_REF}"

          CANDIDATE_API_BASES=()
          if [ -n "${GITHUB_SERVER_URL:-}" ]; then
            CANDIDATE_API_BASES+=("${GITHUB_SERVER_URL%/}/api/v1")
          fi
          CANDIDATE_API_BASES+=("http://${GITEA_REGISTRY_IP}:3001/api/v1")
          CANDIDATE_API_BASES+=("http://${GITEA_REGISTRY_HOST}:3001/api/v1")

          if ! command -v curl >/dev/null 2>&1; then
            export DEBIAN_FRONTEND=noninteractive
            apt-get update -qq
            apt-get install -y -qq curl ca-certificates
          fi

          HELPER_PATH="/tmp/dispatch-workflow.sh"

          fetch_dispatch_helper() {
            local helper_ref="$1"
            local api_base
            for api_base in "${CANDIDATE_API_BASES[@]}"; do
              helper_url="${api_base}/repos/${REPO_OWNER}/${REPO_NAME}/raw/scripts/dispatch-workflow.sh?ref=${helper_ref}"
              if curl -fsS --connect-timeout 5 --max-time 20 \
                -H "Authorization: token ${DISPATCH_TOKEN}" \
                -H "User-Agent: plex-playlist-cicd-base" \
                -o "${HELPER_PATH}" \
                "${helper_url}"; then
                chmod +x "${HELPER_PATH}"
                return 0
              fi
            done
            return 1
          }

          if ! fetch_dispatch_helper "${TARGET_REF}" && ! fetch_dispatch_helper "${HEAD_SHA}"; then
            echo "❌ Failed to fetch scripts/dispatch-workflow.sh from repository"
            exit 1
          fi

          DISPATCH_ARGS=(
            --token "${DISPATCH_TOKEN}"
            --repo "${REPO_FULL}"
            --workflow "docker-build-main.yaml"
            --ref "${TARGET_REF}"
            --head-sha "${HEAD_SHA}"
            --source-workflow "CICD Base Image"
            --trace-id "${TRACE_ID}"
            --base-needed "true"
            --base-hash "${BASE_HASH}"
          )

          for API_BASE in "${CANDIDATE_API_BASES[@]}"; do
            DISPATCH_ARGS+=(--api-base "${API_BASE}")
          done

          "${HELPER_PATH}" "${DISPATCH_ARGS[@]}"

      - name: Failure diagnostics
        if: failure()
        run: |
          echo "=== Failure Diagnostics ==="
          date -u '+timestamp_utc=%Y-%m-%dT%H:%M:%SZ'
          echo "runner_name=${RUNNER_NAME:-unknown}"
          echo "runner_hostname=${HOSTNAME:-unknown}"
          uname -a || true
          cat /etc/os-release 2>/dev/null || true
          df -h || true
          free -h || true
          ps aux --sort=-%mem | head -n 30 || true

          if command -v docker >/dev/null 2>&1; then
            echo "=== Docker Diagnostics ==="
            docker version || true
            docker info || true
            docker ps -a || true
            docker images --digests | head -n 50 || true
          else
            echo "docker not available on this runner"
          fi

          echo "=== Kernel Tail ==="
          dmesg | tail -n 120 || true