name: Publish a Docker image to ghcr.io
on:
  push:
    tags:
      - v*.*.*
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: echo "REPO=${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
      - name: Enable buildx
        uses: docker/setup-buildx-action@v1
      - name: Login
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Docker build/push
        uses: docker/build-push-action@v2
        with:
          context: .
          push: true
          tags: ghcr.io/${{ env.REPO }}:latest