docker.yml

name: Docker

on:
  push:
    tags:
      - '*'
  pull_request:

jobs:
  docker:
    runs-on: ubuntu-latest

    steps:
      - 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
          buildkitd-flags: --debug

      - 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
        uses: docker/login-action@v1 
        # The secrets are not available in pull_requests. This step is only
        # needed to push, so it's fine to skip this in PR builds.
        if: ${{ github.event_name != 'pull_request' }}
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Output version
        id: version
        run: |
          echo ::set-output name=version::${GITHUB_REF##*/}

      - name: Build and push
        uses: docker/build-push-action@v2
        with:
          # Only push if there was a tag pushed
          push: ${{ github.event_name != 'pull_request' }}
          cache-from: type=local,src=/tmp/.buildx/cache
          cache-to: type=local,dest=/tmp/.buildx/cache,mode=max
          tags: |
            ${{ github.repository }}:latest
            ${{ github.repository }}:${{ steps.version.outputs.version }}