Add Docker metadata, Buildx, and layer caching to release workflow

Author: ezhlobo

.github/workflows/release-image.yml

@@ -26,9 +26,25 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/devcontainer
+          tags: |
+            type=sha
+            type=raw,value=latest
+            type=schedule,pattern={{date 'YYYYMMDD'}}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
           context: ./image
           push: true
-          tags: ghcr.io/${{ github.repository_owner }}/devcontainer:latest
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max