feat: Improve cache hit on build

.github/workflows/publish.yml

@@ -18,7 +18,7 @@ on:
 env:
   IMAGE_NAME: cdalvaro/docker-salt-master
   PLATFORMS: linux/amd64,linux/arm64,linux/arm/v7
-  CACHE_PATH: /tmp/.buildx-docker-salt-master-cache
+  CACHE_PATH: ${{ github.workspace }}/.buildx-cache
   EXTRA_REGISTRIES: ghcr.io quay.io
 
 jobs:
@@ -46,6 +46,7 @@ jobs:
           echo "Docker image: '${DOCKER_IMAGE}'"
           echo "Tags: ${TAGS}"
 
+          # FIXME: set-output is deprecated
           echo ::set-output name=tags::${TAGS}
 
       - name: VCS ref
@@ -53,6 +54,7 @@ jobs:
         run: |
           VCS_REF="${GITHUB_SHA::8}"
           echo "VCS ref: ${VCS_REF}"
+          # FIXME: set-output is deprecated
           echo ::set-output name=vcs_ref::${VCS_REF}
 
       - name: Created On
@@ -60,6 +62,7 @@ jobs:
         run: |
           CREATED_ON="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
           echo "Created on: ${CREATED_ON}"
+          # FIXME: set-output is deprecated
           echo ::set-output name=created_on::${CREATED_ON}
 
       - name: Dump environment
@@ -87,6 +90,7 @@ jobs:
         uses: docker/setup-buildx-action@v2.2.1
 
       - name: Cache Docker layers
+        id: cache-docker-layers
         uses: actions/cache@v3
         with:
           path: ${{ env.CACHE_PATH }}
@@ -94,6 +98,17 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-buildx-
 
+      - name: Cache hit
+        continue-on-error: true
+        env:
+          CACHE_HIT: ${{ steps.cache-docker-layers.outputs.cache-hit }}
+        run: |
+          if [[ "${CACHE_HIT}" != 'true' ]]; then
+            echo "No cache hit" >&2
+            exit 1
+          fi
+          echo "Cache contents available at: ${CACHE_PATH}"
+
       - name: Login to Docker Container Registry
         uses: docker/login-action@v2.1.0
         with:
@@ -127,5 +142,6 @@ jobs:
             type=local,src=${{ env.CACHE_PATH }}
             ghcr.io/cdalvaro/docker-salt-master:latest
           cache-to: type=local,dest=${{ env.CACHE_PATH }}
+          pull: true
           push: true
           tags: ${{ needs.metadata.outputs.tags }}