build-and-push.yml

on:
  push:
    branches: ["*"]
    tags: ["v*.*.*"]
jobs:
  build:
    runs-on: "ubuntu-20.04"
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Use buildx cache
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-
      -
        name: Authorize to ghcr.io
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      -
        name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Docker meta
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: |
            ghcr.io/${{ github.repository }}
          flavor:
            latest=false
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=edge,branch=master
      -
        name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          context: ./
          file: ./Dockerfile
          builder: ${{ steps.buildx.outputs.name }}
          push: ${{ github.event_name == 'push' && (github.event.ref == 'refs/heads/master' || startsWith(github.event.ref, 'refs/tags/v')) }}
          tags: ${{ steps.meta.outputs.tags }}
          cache-from: type=local,src=/tmp/.buildx-cache
          # see "Move cache" step for details
          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
      -
        name: Move cache (fix growing cache)
        # https://github.com/docker/build-push-action/blob/master/docs/advanced/cache.md#local-cache
        # https://github.com/docker/build-push-action/issues/252
        # https://github.com/moby/buildkit/issues/1896
        run: |
          rm -rf /tmp/.buildx-cache
          mv /tmp/.buildx-cache-new /tmp/.buildx-cache
      -
        name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}