docker-image-test.yml

name: Docker build test

# When its time to do a release do a full cross platform build for all supported
# architectures and push all of them to Docker Hub & Github container registry.
# Only trigger on semver shaped tags.
on:
  pull_request:
    # The branches below must be a subset of the branches above
    branches:
      - "master"
      - "dev"
    paths-ignore:
      - "**/README.md"
      - "**/.github"
      - "**/docs"

jobs:
  docker-build-test:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v3
        with:
          # list of Docker images to use as base name for tags
          images: |
            hibare/moni
          # generate Docker tags based on the following events/attributes
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
        with:
          platforms: all

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1

      - name: Cache Docker layers
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-

      - name: Login to DockerHub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          push: false
          builder: ${{ steps.buildx.outputs.name }}
          platforms: linux/amd64,linux/arm/v7,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache

      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}