push_docker_image.yml

name: Push Docker image
on:
  push:
    branches:
      - master
    tags:
      - .*
jobs:
  push_docker_image:
    name: Push Docker image to GitHub Packages
    runs-on: ubuntu-20.04
    steps:
      - name: Check out the repo
        uses: actions/checkout@v2
      - name: Determine tag name
        run: |
          VERSION=$(echo $GITHUB_REF | sed -e 's,.*/\(.*\),\1,')

          # If we're not tagged in git, tag as latest.
          if [[ "$GITHUB_REF" != "refs/tags/"* ]]; then
            VERSION=latest
          fi

          # Preserve our tag name for later
          echo "tag_name=${VERSION,,}" >> $GITHUB_ENV
          # Use lowercase name of repository, as buildx rejects the name otherwise.
          echo "repository=${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
      - name: Set up Docker 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 GitHub Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: ghcr.io/${{ env.repository }}:${{ env.tag_name }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache