chore: multi platform docker image

Author: fengkx

.github/workflows/dockerimage.yml

@@ -4,11 +4,33 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
-    - name: Publish to Registry
-      uses: elgohr/Publish-Docker-Github-Action@master
-      with:
-        name: fengkx/node_rssbot
-        snapshot: true
-        username: ${{ secrets.DOCKER_USERNAME }}
-        password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Checkout
+        uses: actions/checkout@v2
+      - 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
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: output-docker-tag
+        shell: bash
+        id: docker-tag
+        run: |    
+          BRANCH_NAME=`echo $GITHUB_REF | cut -d '/' -f3 -`
+          echo "BRANCH_NAME: $BRANCH_NAME"
+          unset IMG_TAGS ; if [[ $BRANCH_NAME == "master" ]]; then IMG_TAGS='latest' ; else IMG_TAGS="$BRANCH_NAME"; fi
+          SHA_TAG=`echo $GITHUB_SHA | head -c 6`
+          echo "SHA_TAG: $SHA_TAG"
+          IMG_TAGS="$IMG_TAGS,$SHA_TAG"
+          echo "IMAG_TAGS: $IMG_TAGS"
+          echo ::set-output name=DOCKER_TAGS::${IMG_TAGS}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6
+          push: true
+          tags: fengkx/node_rssbot:${{steps.docker-tag.outputs.DOCKER_TAGS}}