esphome/.github/workflows/ci-docker.yml

name: CI for docker images

# Only run when docker paths change
on:
  push:
    branches: [dev, beta, master]
    paths:
      - 'docker/**'
      - '.github/workflows/**'

  pull_request:
    paths:
      - 'docker/**'
      - '.github/workflows/**'

jobs:
  check-docker:
    name: Build docker containers
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        arch: [amd64, armv7, aarch64]
        build_type: ["hassio", "docker"]
    steps:
      - uses: actions/checkout@v2
      - name: Set up env variables
        run: |
          base_version="3.4.0"

          if [[ "${{ matrix.build_type }}" == "hassio" ]]; then
            build_from="esphome/esphome-hassio-base-${{ matrix.arch }}:${base_version}"
            build_to="esphome/esphome-hassio-${{ matrix.arch }}"
            dockerfile="docker/Dockerfile.hassio"
          else
            build_from="esphome/esphome-base-${{ matrix.arch }}:${base_version}"
            build_to="esphome/esphome-${{ matrix.arch }}"
            dockerfile="docker/Dockerfile"
          fi

          echo "BUILD_FROM=${build_from}" >> $GITHUB_ENV
          echo "BUILD_TO=${build_to}" >> $GITHUB_ENV
          echo "DOCKERFILE=${dockerfile}" >> $GITHUB_ENV          
      - name: Pull for cache
        run: |
          docker pull "${BUILD_TO}:dev" || true          
      - name: Register QEMU binfmt
        run: docker run --rm --privileged multiarch/qemu-user-static:5.2.0-2 --reset -p yes
      - run: |
          docker build \
            --build-arg "BUILD_FROM=${BUILD_FROM}" \
            --build-arg "BUILD_VERSION=ci" \
            --cache-from "${BUILD_TO}:dev" \
            --file "${DOCKERFILE}" \
            .