Migrate build to build-push-action@v2 (#11)

.github/workflows/build.yaml

@@ -14,9 +14,11 @@ on:
       - build/entrypoint.sh
       - build/gpgparams
       - build/VERSION
+  pull_request:
 
 env:
   DOCKER_REPO: shenxn/protonmail-bridge
+  DOCKER_REPO_DEV: shenxn/protonmail-bridge-dev
 
 jobs:
   build:
@@ -24,10 +26,34 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@master
-      - name: Set up Docker buildx
-        uses: crazy-max/ghaction-docker-buildx@v2
-      - name: Build image
-        run: bash build/build-docker.sh
-        env:
-          DOCKER_USERNAME: ${{ secrets.REGISTRY_USERNAME }}
-          DOCKER_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
+      - name: Set version
+        id: version
+        run: echo "::set-output name=version::`cat build/VERSION`"
+      - name: Set repo
+        id: repo
+        run: if [[ $GITHUB_REF == "refs/heads/master" ]]; then echo "::set-output name=repo::${DOCKER_REPO}"; else echo "::set-output name=repo::${DOCKER_REPO_DEV}"; fi
+      - name: Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v1
+        with:
+          images: ${{ steps.repo.outputs.repo }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        if: ${{ github.event_name != 'pull_request' }}
+        with:
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - uses: docker/build-push-action@v2
+        with:
+          context: ./build
+          file: ./build/Dockerfile
+          platforms: linux/amd64,linux/arm64/v8,linux/arm/v7
+          tags: |
+            ${{ steps.repo.outputs.repo }}:build
+            ${{ steps.repo.outputs.repo }}:${{ steps.version.outputs.version }}-build
+          labels: ${{ steps.docker_meta.outputs.labels }}
+          push: ${{ github.event_name != 'pull_request' }}