Merge pull request #4 from chaspy/renovate/docker-build-push-action-2.x

Update docker/build-push-action action to v2

.github/workflows/docker.yml

@@ -8,12 +8,44 @@ jobs:
     name: Push Docker image to Docker Hub
     runs-on: ubuntu-latest
     steps:
-      - name: Check out the repo
+      - 
+        name: Check out the repo
         uses: actions/checkout@v2
-      - name: Push to Docker Hub
-        uses: docker/build-push-action@v1
+      - 
+        name: Prepare
+        id: prep
+        run: |
+          DOCKER_IMAGE=chaspy/datadog-github-pr
+          VERSION=edge
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/}
+          elif [[ $GITHUB_REF == refs/heads/* ]]; then
+            VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
+          elif [[ $GITHUB_REF == refs/pull/* ]]; then
+            VERSION=pr-${{ github.event.number }}
+          fi
+          TAGS="${DOCKER_IMAGE}:${VERSION}"
+          if [ "${{ github.event_name }}" = "push" ]; then
+            TAGS="$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: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - 
+        name: Login to DockerHub
+        uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
-          repository: chaspy/datadog-github-pr
-          tag_with_ref: true
+       -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.prep.outputs.tags }}
+          cache-from: type=registry,ref=chaspy/datadog-github-pr:latest
+          cache-to: type=inline