Add caching and labels to release workflow

Author: WillFantom

.github/workflows/docker-release.yml

@@ -29,6 +29,14 @@ jobs:
       - 
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
+      -
+        name: Cache Docker Layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
       - 
         name: Login to GHCR
         uses: docker/login-action@v1
@@ -54,3 +62,9 @@ jobs:
             ghcr.io/${{ steps.extract_owner.outputs.owner }}/sui:${{ steps.extract_tag.outputs.tag }}
             docker.io/${{ secrets.DOCKER_USERNAME }}/sui:${{ steps.extract_tag.outputs.tag }}
           no-cache: false
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+          labels: |
+            dev.sui.image.title=${{ github.event.repository.name }}
+            dev.sui.image.description=${{ github.event.repository.description }}
+            dev.sui.image.url=${{ github.event.repository.html_url }}