name: Docker Build/Publish Image 
on:  
  push:    
    branches: [ master ]  
jobs:   
  build:    
    runs-on: ubuntu-18.04    
    env:           
      DOCKER_IMAGE: kshfse/dashy
      DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
      DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}  
      DOCKER_TARGET_PLATFORM: linux/arm/v7                 
    steps:    
    - name: Checkout the code       
      uses: actions/checkout@v1          
    - name: Set up Docker Buildx      
      uses: crazy-max/ghaction-docker-buildx@v1      
      with:        
        version: latest    
    - name: Prepare      
      if: success()      
      id: prepare      
      run: |        
        echo ::set-output name=docker_platform::${DOCKER_TARGET_PLATFORM}        
        echo ::set-output name=docker_image::${DOCKER_REGISTRY}/${DOCKER_IMAGE}        
        echo ::set-output name=version::${GITHUB_RUN_NUMBER}    
    - name: Docker Login      
      if: success()      
      run: |        
        echo "${DOCKER_PASSWORD}" | docker login --username "${DOCKER_USERNAME}" --password-stdin          
    - name: Run Buildx (push image)      
      if: success()      
      run: |        
        docker buildx build --platform ${{ steps.prepare.outputs.docker_platform }} --tag ${{ steps.prepare.outputs.docker_image }}:${{ steps.prepare.outputs.version }} --file ./docker/Dockerfile-multi-arch --output type=image,push=true .