Put git metadata into image metadata

Author: sourcefrog

.github/workflows/container.yml

@@ -25,10 +25,17 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/mutants
+
       - name: Build and push container image
         uses: docker/build-push-action@v6
         with:
           context: .
           push: true
           platforms: linux/amd64,linux/arm64
-          tags: ghcr.io/${{ github.repository_owner }}/mutants:latest
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}