CI: cache Docker layers 💚

db-rest equivalent of c8a06f0c6d

.github/workflows/docker-image.yml

@@ -26,23 +26,28 @@ jobs:
     steps:
       - name: check out the repo
         uses: actions/checkout@v2
+      - name: configure Docker to use buildx
+        uses: docker/setup-buildx-action@v2
       - name: log in to Docker Hub
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
       - name: build Docker image & push to Docker Hub
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           context: .
           push: true
           tags: |
             derhuerst/db-rest:6
             derhuerst/db-rest:latest
+          # https://docs.docker.com/build/ci/github-actions/examples/#github-cache
+          cache-from: type=gha
+          cache-to: type=gha,mode=max,oci-mediatypes=true,compression=zstd
 
       # this is for the public-transport/infrastructure cluster
       - name: log in to GitHub Container Registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -54,8 +59,11 @@ jobs:
         id: datetime
         run: echo "::set-output name=datetime::$(date -u +'%Y-%m-%dT%H.%M.%SZ')"
       - name: push Docker image to GitHub Registry
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           context: .
           push: true
           tags: ghcr.io/${{github.repository}}:v6_${{steps.hash.outputs.hash}}_${{steps.datetime.outputs.datetime}}
+          # https://docs.docker.com/build/ci/github-actions/examples/#github-cache
+          cache-from: type=gha
+          cache-to: type=gha,mode=max,oci-mediatypes=true,compression=zstd