build.yml

name: 'build images'

on:
  workflow_dispatch:
  schedule:
    - cron: '7 5 * * *'
  push:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Prepare
        id: prep
        run: |
          DOCKER_IMAGE=trion/ng-cli-karma
          VERSION=latest
          SHORTREF=${GITHUB_SHA::8}

          #use branch as version
          if [[ $GITHUB_REF == refs/heads/* ]]; then
            VERSION=${GITHUB_REF#refs/heads/}
            [ $VERSION == "master" ] && VERSION=latest
          fi

          #use tag as version
          if [[ $GITHUB_REF == refs/tags/* ]]; then
            VERSION=${GITHUB_REF#refs/tags/}
          fi

          #use version as image tag
          TAGS="${DOCKER_IMAGE}:${VERSION}"

          # If version is a number also tag it 'latest'.
          if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
            TAGS="$TAGS,${DOCKER_IMAGE}:latest"
          fi

          echo ::set-output name=tags::${TAGS}
          echo ::set-output name=docker_image::${DOCKER_IMAGE}

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

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@master
      
      - name: Cache Docker layers
        uses: actions/cache@v3
        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@v2
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Build
        uses: docker/build-push-action@v3
        with:
          builder: ${{ steps.buildx.outputs.name }}
          context: .
          file: ./Dockerfile
          #google chrome is just amd64, uses chromium from newer debian as replacement
          #platforms: linux/amd64,linux/arm64,linux/arm/v7
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.prep.outputs.tags }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache-new