publish-docker.yml

name: Publish Docker image

on:
  push:
    branches:
      - main
env:
  IMAGE_NAME: fasten.pypiresolver

jobs:
  push:

    runs-on: ubuntu-18.04

    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Build Docker image
        run: docker build -t $IMAGE_NAME .

      - name: Log into registry
        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login docker.pkg.github.com -u ${{ github.actor }} --password-stdin

      - name: Push image
        run: |
          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/$IMAGE_NAME

          # Change all uppercase to lowercase
          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
          
          # Strip git ref prefix from version
          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')

          # Strip "v" prefix from tag name
          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')

          # Use Docker `latest` tag convention
          [ "$VERSION" == "master" ] && VERSION=${GITHUB_SHA::8}
          echo IMAGE_ID=$IMAGE_ID
          echo VERSION=$VERSION

          # Push images

          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
          docker push $IMAGE_ID:$VERSION

          docker tag $IMAGE_NAME $IMAGE_ID:latest
          docker push $IMAGE_ID:latest