Use nginx-side readiness probe for E2E frontend

.gitea/workflows/cicd.yaml

@@ -2320,7 +2320,6 @@ jobs:
           DB_PASSWORD="plex_password"
           DB_URL="postgresql://plex_user:${DB_PASSWORD}@database:5432/plex_playlist"
           E2E_REPO_DIR="$(mktemp -d)"
-          FRONTEND_URL_COMPOSE="http://frontend:80"
 
           if ! command -v docker >/dev/null 2>&1; then
             echo "❌ Docker is required"
@@ -2412,44 +2411,6 @@ jobs:
             echo "${http_code}"
           }
 
-          fetch_url_from_backend() {
-            target_url="$1"
-            output_file="$2"
-            probe_tmp="$(mktemp)"
-
-            if ! docker run --rm \
-              --network "${COMPOSE_PROJECT_NAME}_default" \
-              "${INTEGRATION_TESTER_DIGEST_REF}" \
-              python -c "$(printf '%s\n' \
-              'import sys' \
-              'import urllib.error' \
-              'import urllib.request' \
-              'target_url = sys.argv[1]' \
-              'try:' \
-              '    with urllib.request.urlopen(target_url, timeout=2) as response:' \
-              '        body = response.read().decode(\"utf-8\", errors=\"replace\")' \
-              '        print(response.status)' \
-              '        print(body)' \
-              'except urllib.error.HTTPError as err:' \
-              '    body = err.read().decode(\"utf-8\", errors=\"replace\")' \
-              '    print(err.code)' \
-              '    print(body)' \
-              'except Exception:' \
-              '    print(\"000\")' \
-              '    print("")')" \
-              "${target_url}" >"${probe_tmp}" 2>/dev/null; then
-              : >"${output_file}"
-              rm -f "${probe_tmp}"
-              echo "000"
-              return 0
-            fi
-
-            http_code="$(head -n 1 "${probe_tmp}")"
-            tail -n +2 "${probe_tmp}" >"${output_file}"
-            rm -f "${probe_tmp}"
-            echo "${http_code}"
-          }
-
           dump_failure_context() {
             echo "=== Runtime E2E Failure Context ==="
             docker compose -p "${COMPOSE_PROJECT_NAME}" -f "${COMPOSE_FILE}" ps || true
@@ -2643,13 +2604,10 @@ jobs:
           for i in $(seq 1 30); do
             frontend_running_count="$(docker compose -p "${COMPOSE_PROJECT_NAME}" -f "${COMPOSE_FILE}" ps --status running --services frontend | wc -l)"
             if [ "${frontend_running_count}" -gt 0 ]; then
-              frontend_root_code="$(fetch_url_from_backend "${FRONTEND_URL_COMPOSE}" /tmp/e2e-frontend-root.html)"
-              case "${frontend_root_code}" in
-                2*|3*)
-                  frontend_ready=true
-                  break
-                  ;;
-              esac
+              if docker compose -p "${COMPOSE_PROJECT_NAME}" -f "${COMPOSE_FILE}" exec -T frontend sh -lc 'wget -q -T 2 -O /dev/null http://127.0.0.1/'; then
+                frontend_ready=true
+                break
+              fi
             fi
             sleep 2
           done