Simplify "Complete workflow" with Docker meta action

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/example.yml

@@ -1,5 +1,4 @@
 # This workflow is provided just as an usage example and not for repo testing/verification
-# See https://github.com/docker/build-push-action#complete-workflow
 name: example
 
 on:
@@ -12,6 +11,9 @@ on:
       - 'v*.*.*'
   pull_request:
 
+env:
+  DOCKER_IMAGE: localhost:5000/name/app
+
 jobs:
   docker:
     runs-on: ubuntu-latest
@@ -25,34 +27,12 @@ jobs:
         name: Checkout
         uses: actions/checkout@v2.3.3
       -
-        name: Prepare
-        id: prep
-        run: |
-          DOCKER_IMAGE=localhost:5000/name/app
-          VERSION=noop
-          if [ "${{ github.event_name }}" = "schedule" ]; then
-            VERSION=nightly
-          elif [[ $GITHUB_REF == refs/tags/* ]]; then
-            VERSION=${GITHUB_REF#refs/tags/}
-          elif [[ $GITHUB_REF == refs/heads/* ]]; then
-            VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
-            if [ "${{ github.event.repository.default_branch }}" = "$VERSION" ]; then
-              VERSION=edge
-            fi
-          elif [[ $GITHUB_REF == refs/pull/* ]]; then
-            VERSION=pr-${{ github.event.number }}
-          fi
-          TAGS="${DOCKER_IMAGE}:${VERSION}"
-          if [[ $VERSION =~ ^v[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
-            MINOR=${VERSION%.*}
-            MAJOR=${MINOR%.*}
-            TAGS="$TAGS,${DOCKER_IMAGE}:${MINOR},${DOCKER_IMAGE}:${MAJOR},${DOCKER_IMAGE}:latest"
-          elif [ "${{ github.event_name }}" = "push" ]; then
-            TAGS="$TAGS,${DOCKER_IMAGE}:sha-${GITHUB_SHA::8}"
-          fi
-          echo ::set-output name=version::${VERSION}
-          echo ::set-output name=tags::${TAGS}
-          echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+        name: Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v1
+        with:
+          images: ${{ env.DOCKER_IMAGE }} # list of Docker images to use as base name for tags
+          tag-sha: true # add git short SHA as Docker tag
       -
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
@@ -64,15 +44,9 @@ jobs:
         with:
           context: ./test
           file: ./test/Dockerfile
-          outputs: type=docker
-          tags: ${{ steps.prep.outputs.tags }}
-          labels: |
-            org.opencontainers.image.created=${{ steps.prep.outputs.created }}
-            org.opencontainers.image.url=${{ github.event.repository.html_url }}
-            org.opencontainers.image.source=${{ github.event.repository.clone_url }}
-            org.opencontainers.image.version=${{ steps.prep.outputs.version }}
-            org.opencontainers.image.revision=${{ github.sha }}
-            org.opencontainers.image.licenses=${{ github.event.repository.license.spdx_id }}
+          load: true
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
       -
         name: Build and push to local registry
         uses: ./
@@ -80,23 +54,17 @@ jobs:
           context: ./test
           file: ./test/Dockerfile
           push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.prep.outputs.tags }}
-          labels: |
-            org.opencontainers.image.created=${{ steps.prep.outputs.created }}
-            org.opencontainers.image.url=${{ github.event.repository.html_url }}
-            org.opencontainers.image.source=${{ github.event.repository.clone_url }}
-            org.opencontainers.image.version=${{ steps.prep.outputs.version }}
-            org.opencontainers.image.revision=${{ github.sha }}
-            org.opencontainers.image.licenses=${{ github.event.repository.license.spdx_id }}
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
       -
         name: Inspect image
         run: |
-          docker image inspect localhost:5000/name/app:${{ steps.prep.outputs.version }}
+          docker image inspect ${{ env.DOCKER_IMAGE }}:${{ steps.docker_meta.outputs.version }}
       -
         name: Check manifest
         if: github.event_name != 'pull_request'
         run: |
-          docker buildx imagetools inspect localhost:5000/name/app:${{ steps.prep.outputs.version }}
+          docker buildx imagetools inspect ${{ env.DOCKER_IMAGE }}:${{ steps.docker_meta.outputs.version }}
       -
         name: Dump context
         if: always()