Update release-container.yaml

Better image tagging and labels, attestation

.github/workflows/release-container.yaml

@@ -7,13 +7,6 @@ on:
 
 jobs:
   release-container-image:
-    strategy:
-      matrix:
-        containers:
-          - file: Dockerfile
-            tags: |
-              simonkowallik/tmconfpy:latest
-              ghcr.io/simonkowallik/tmconfpy:latest
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -42,17 +35,33 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Extract metadata (tags, labels)
+        id: metadata
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+              ${{ github.repository }}
+              ghcr.io/${{ github.repository }}
+          
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64
-          file: ${{ matrix.containers.file }}
+          file: Dockerfile
           push: true
           cache-from: type=gha
           cache-to: type=gha,mode=max
-          tags: ${{ matrix.containers.tags }}
+          tags: ${{ steps.metadata.outputs.tags }}
+          labels: ${{ steps.metadata.outputs.labels }}
 
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v1
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true
+
       - name: Docker Hub Description
         uses: peter-evans/dockerhub-description@v4
         with: