Fix docker cache in github actions

Author: martenrichter

.github/workflows/docker-publish.yml

@@ -125,6 +125,9 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
       # Extract metadata (tags, labels) for Docker
       # https://github.com/docker/metadata-action
       - name: Extract Docker metadata
@@ -133,6 +136,9 @@ jobs:
         uses: docker/metadata-action@v4
         with:
           images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ matrix.container }}
+          labels: |
+            org.opencontainers.image.title=${{ matrix.container }}
+            org.opencontainers.image.description=Component ${{ matrix.container }} from the fancy-lectures monorepo
           tags: |
             type=schedule
             type=ref,event=branch