docker-ci.yaml

name: Docker CI

on:
  push:
    branches-ignore: ["main"]
    tags-ignore: ["**"]

jobs:
  ci:
    name: Build Docker image
    runs-on: ubuntu-20.04
    steps:
      - name: Checkout code
        uses: actions/checkout@v2.3.4
      - name: Setup QEMU
        uses: docker/setup-qemu-action@v1.1.0
      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@v1.3.0
        with:
          install: true
      # Multi-arch builds run in parallel and are thus much faster than a set
      # of single-arch builds. Subsequent builds leverage the same build-cache,
      # so nothing gets build twice...
      - name: Build image (multi-arch)
        run: |
          tag="${GITHUB_SHA:0:7}"
          echo docker_tag="$tag" >> $GITHUB_ENV
          docker build \
            --tag thijsputman/tc66c-mqtt:"$tag" \
            --platform linux/arm64/v8,linux/arm/v7,linux/amd64 \
            .
      # Build and upload a separate Docker image for each architecture (to
      # facilitate testing – the images are not available anywhere else).
      # Separating the artifacts is out of convenience (otherwise one would
      # need to download a single big artifact containing all images).
      - name: Build image (ARM64)
        run: |
          docker build \
            --tag thijsputman/tc66c-mqtt:"${{ env.docker_tag }}" \
            --output type=docker,dest=/tmp/buildx-arm64.tar \
            --platform linux/arm64/v8 \
            .
      - name: Upload artifact (ARM64)
        uses: actions/upload-artifact@v2
        with:
          name: buildx-arm64
          path: /tmp/buildx-arm64.tar
          retention-days: 30
      - name: Build image (ARMv7)
        run: |
          docker build \
            --tag thijsputman/tc66c-mqtt:"${{ env.docker_tag }}" \
            --output type=docker,dest=/tmp/buildx-armv7.tar \
            --platform linux/arm/v7 \
            .
      - name: Upload artifact (ARMv7)
        uses: actions/upload-artifact@v2
        with:
          name: buildx-armv7
          path: /tmp/buildx-armv7.tar
          retention-days: 30
      - name: Build image (AMD64)
        run: |
          docker build \
            --tag thijsputman/tc66c-mqtt:"${{ env.docker_tag }}" \
            --output type=docker,dest=/tmp/buildx-amd64.tar \
            --platform linux/amd64 \
            .
      - name: Upload artifact (AMD64)
        uses: actions/upload-artifact@v2
        with:
          name: buildx-amd64
          path: /tmp/buildx-amd64.tar
          retention-days: 30