name: Docker Image CI

on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]

jobs:

  build:

    runs-on: ubuntu-latest
    env:
      DOCKER_REGISTRY: ghcr.io
      DOCKER_IMAGE: dragonchaser/motsognir
      DOCKER_TARGET_PLATFORM: "linux/arm/v7,linux/arm64,linux/amd64"

    steps:
    - uses: actions/checkout@v2

    - 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}    
        echo ::set-output name=version::latest

    - name: Log into registry
      run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
      
    - name: Run Buildx
      if: success()
      run: |
        cd motsognir
        docker buildx build --platform ${{ steps.prepare.outputs.docker_platform }} --tag ${{ steps.prepare.outputs.docker_image }}:${{steps.prepare.outputs.version }} --file ./Dockerfile.arm32v7 --output type=image,push=true .