Define docker_login_with_retry in base and CICD build jobs

.gitea/workflows/cicd.yaml

@@ -314,6 +314,25 @@ jobs:
             rm -f "${headers_file}"
           }
 
+          docker_login_with_retry() {
+            attempts="${1:-5}"
+            backoff="${2:-3}"
+            attempt=1
+            while [ "${attempt}" -le "${attempts}" ]; do
+              ensure_registry_auth_realm_host
+              if echo "${PACKAGE_ACCESS_TOKEN}" | docker login "http://${GITEA_REGISTRY}" -u "${REGISTRY_USER}" --password-stdin; then
+                return 0
+              fi
+              if [ "${attempt}" -lt "${attempts}" ]; then
+                sleep_seconds=$((backoff * attempt))
+                echo "docker login failed; retrying in ${sleep_seconds}s"
+                sleep "${sleep_seconds}"
+              fi
+              attempt=$((attempt + 1))
+            done
+            return 1
+          }
+
           if ! grep -q "${GITEA_REGISTRY_HOST}" /etc/hosts; then
             echo "${GITEA_REGISTRY_IP} ${GITEA_REGISTRY_HOST}" >> /etc/hosts
           fi
@@ -516,6 +535,25 @@ jobs:
             rm -f "${headers_file}"
           }
 
+          docker_login_with_retry() {
+            attempts="${1:-5}"
+            backoff="${2:-3}"
+            attempt=1
+            while [ "${attempt}" -le "${attempts}" ]; do
+              ensure_registry_auth_realm_host
+              if echo "${PACKAGE_ACCESS_TOKEN}" | docker login "http://${GITEA_REGISTRY}" -u "${REGISTRY_USER}" --password-stdin; then
+                return 0
+              fi
+              if [ "${attempt}" -lt "${attempts}" ]; then
+                sleep_seconds=$((backoff * attempt))
+                echo "docker login failed; retrying in ${sleep_seconds}s"
+                sleep "${sleep_seconds}"
+              fi
+              attempt=$((attempt + 1))
+            done
+            return 1
+          }
+
           echo "=== Pre-build disk telemetry ==="
           df -h || true
           if command -v docker >/dev/null 2>&1; then