update CI

.github/workflows/buildx.yaml

@@ -1,33 +1,41 @@
-# ref: https://github.com/crazy-max/diun/blob/master/.github/workflows/build.yml
+# ref: https://blog.oddbit.com/post/2020-09-25-building-multi-architecture-im/
 
 name: Docker
-on: [push]
+
+on: 
+  push:
+    branches:
+    - master
+    tags:
+    - 'v*'
+
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
     - name: Prepare
       id: prepare
       run: |
+        DOCKER_IMAGE=${{ secrets.DOCKER_IMAGE }}
+        VERSION=latest
+        SHORTREF=${GITHUB_SHA::8}
+
+        # If this is git tag, use the tag name as a docker tag
         if [[ $GITHUB_REF == refs/tags/* ]]; then
-          echo ::set-output name=version::${GITHUB_REF#refs/tags/v}
-        elif [[ $GITHUB_REF == refs/heads/master ]]; then
-          echo ::set-output name=version::latest
-        elif [[ $GITHUB_REF == refs/heads/* ]]; then
-          echo ::set-output name=version::${GITHUB_REF#refs/heads/}
-        else
-          echo ::set-output name=version::snapshot
+          VERSION=${GITHUB_REF#refs/tags/v}
+        fi
+        TAGS="${DOCKER_IMAGE}:${VERSION},${DOCKER_IMAGE}:${SHORTREF}"
+
+        # If the VERSION looks like a version number, assume that
+        # this is the most recent version of the image and also
+        # tag it 'latest'.
+        if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+          TAGS="$TAGS,${DOCKER_IMAGE}:latest"
         fi
 
-        echo ::set-output name=docker_platforms::linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/386
-        echo ::set-output name=docker_image::${{ secrets.DOCKER_IMAGE }}
-
-      # https://github.com/crazy-max/ghaction-docker-buildx
-    - name: Set up Docker Buildx
-      id: buildx
-      uses: crazy-max/ghaction-docker-buildx@v1
-      with:
-        version: latest
+        # Set output parameters.
+        echo ::set-output name=tags::${TAGS}
+        echo ::set-output name=docker_image::${DOCKER_IMAGE}
 
     - name: Environment
       run: |
@@ -43,32 +51,23 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v2
 
-    - name: Docker Buildx (no push)
-      run: |
-        docker buildx bake \
-          --set ${{ github.event.repository.name }}.platform=${{ steps.prepare.outputs.docker_platforms }} \
-          --set ${{ github.event.repository.name }}.output=type=image,push=false \
-          --set ${{ github.event.repository.name }}.tags="${{ steps.prepare.outputs.docker_image }}:${{ steps.prepare.outputs.version }}" \
-          --file docker-compose.yaml
-
     - name: Docker Login
-      if: success()
-      env:
-        DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
-      run: |
-        echo "${DOCKER_PASSWORD}" | docker login --username "${{ secrets.DOCKER_USERNAME }}" --password-stdin
-
-    - name: Docker Buildx (push)
-      if: success()
-      run: |
-        docker buildx bake \
-          --set ${{ github.event.repository.name }}.platform=${{ steps.prepare.outputs.docker_platforms }} \
-          --set ${{ github.event.repository.name }}.output=type=image,push=true \
-          --set ${{ github.event.repository.name }}.tags="${{ steps.prepare.outputs.docker_image }}:${{ steps.prepare.outputs.version }}" \
-          --file docker-compose.yaml
-
-    - name: Clear
-      if: always()
-      run: |
-        rm -f ${HOME}/.docker/config.json
-
+      if: github.event_name != 'pull_request'
+      uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+    
+    - name: Set up Docker Buildx
+      id: buildx
+      uses: docker/setup-buildx-action@v1
+    
+    - name: Build and push
+      uses: docker/build-push-action@v2
+      with:
+        builder: ${{ steps.buildx.outputs.name }}
+        context: .
+        file: ./Dockerfile
+        platforms: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/ppc64le,linux/s390x
+        push: true
+        tags: ${{ steps.prepare.outputs.tags }}