name: Build and Release Runners

on:
  pull_request:
    branches:
      - '**'
    paths:
      - 'runner/**'
      - .github/workflows/build-runner.yml
  push:
    branches:
      - master
    paths:
      - runner/patched/*
      - runner/Dockerfile
      - runner/dindrunner.Dockerfile
      - runner/entrypoint.sh
      - .github/workflows/build-runner.yml
  release:
    types: [published]

jobs:
  build:
    runs-on: ubuntu-latest
    name: Build ${{ matrix.name }}
    strategy:
      matrix:
        include:
          - name: actions-runner
            dockerfile: Dockerfile
          - name: actions-runner-dind
            dockerfile: dindrunner.Dockerfile
    env:
      RUNNER_VERSION: 2.276.1
      DOCKER_VERSION: 19.03.12
      DOCKERHUB_USERNAME: ${{ github.repository_owner }}
    steps:
      - name: Set outputs
        id: vars
        run: echo ::set-output name=sha_short::${GITHUB_SHA::7}

      - name: Checkout
        uses: actions/checkout@v2

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

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
        with:
          version: latest

      - name: Login to DockerHub
        uses: docker/login-action@v1
        if: ${{ github.event_name == 'push' }}
        with:
          username: ${{ github.repository_owner }}
          password: ${{ secrets.DOCKER_ACCESS_TOKEN }}

      # Considered unstable builds
      # Mutable (no sha) and immutable (include sha) tags are created, see Issue 285 and PR 286 for why
      - name: Build and push canary builds
        uses: docker/build-push-action@v2
        with:
          context: ./runner
          file: ./runner/${{ matrix.dockerfile }}
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' && github.event_name != 'release' }}
          build-args: |
            RUNNER_VERSION=${{ env.RUNNER_VERSION }}
            DOCKER_VERSION=${{ env.DOCKER_VERSION }}
          tags: |
            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}-canary
            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}-canary-${{ steps.vars.outputs.sha_short }}

      # Considered stable builds
      # Mutable (no sha) and immutable (include sha) tags are created, see Issue 285 and PR 286 for why
      - name: Build and push release builds
        uses: docker/build-push-action@v2
        with:
          context: ./runner
          file: ./runner/${{ matrix.dockerfile }}
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name == 'release' }}
          build-args: |
            RUNNER_VERSION=${{ env.RUNNER_VERSION }}
            DOCKER_VERSION=${{ env.DOCKER_VERSION }}
          tags: |
            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}
            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}-${{ steps.vars.outputs.sha_short }}
            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:latest