updated image labels

Author: hansidm

.github/workflows/docker-image.yml

@@ -31,14 +31,15 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Docker metadata
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY_IMAGE }}
-          tags: |
-            type=semver,pattern={{version}},enable=${{ startsWith(github.ref, 'refs/tags/v') }}
-            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+      - name: Prepare image tags
+        id: prep
+        run: |
+          if [[ "${GITHUB_REF}" != refs/tags/v* ]]; then
+            echo "This workflow must be triggered from a tag named like v1.2.3" >&2
+            exit 1
+          fi
+          VERSION="${GITHUB_REF_NAME#v}"
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
 
       - name: Build and push
         uses: docker/build-push-action@v6
@@ -47,5 +48,10 @@ jobs:
           file: ./docker/Dockerfile-demo
           platforms: linux/amd64,linux/arm64
           push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
+          tags: |
+            ${{ env.REGISTRY_IMAGE }}:${{ steps.prep.outputs.version }}
+            ${{ env.REGISTRY_IMAGE }}:latest
+          labels: |
+            org.opencontainers.image.source=${{ github.repository }}
+            org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.version=${{ steps.prep.outputs.version }}