fix(ci): quote description to satisfy yaml parser

.gitea/workflows/docker-build-deploy-fleet.yml

@@ -32,7 +32,7 @@ on:
         default: Dockerfile
 
       tag:
-        description: Optional tag to publish (default: sha-<shortsha>)
+        description: "Optional tag to publish (default: sha-<shortsha>)"
         type: string
         default: ""
 
@@ -176,14 +176,14 @@ jobs:
 
           # Derive source tags from build_matrix_json using Node (available in Actions runners).
           # Each source is "${IMAGE}:${SHA_TAG}-<arch>" where <arch> from platform suffix.
-          mapfile -t sources < <(node -e '
+          mapfile -t sources < <(IMAGE="${IMAGE}" SHA_TAG="${SHA_TAG}" node -e '
             const m = JSON.parse(process.env.BUILD_MATRIX_JSON);
             for (const it of m) {
               const arch = String(it.platform || "").split("/").pop();
               if (!arch) process.exit(2);
               console.log(`${process.env.IMAGE}:${process.env.SHA_TAG}-${arch}`);
             }
-          ' IMAGE="${IMAGE}" SHA_TAG="${SHA_TAG}")
+          ')
 
           if [[ "${#sources[@]}" -eq 0 ]]; then
             echo "No build sources resolved from build_matrix_json" >&2
@@ -266,4 +266,3 @@ jobs:
           DOCKER_IMAGE: ${{ needs.manifest.outputs.image_ref }}
         run: |
           docker compose ${{ inputs.compose_args }}
-