build-paul.yml

name: Build Paul
on:
  push:
    # Publish `main` as Docker `latest` image.
    branches:
      - main
    # Publish `v1.2.3` tags as releases.
    tags:
      - v*
  # Run tests for any PRs.
  pull_request:

env:
  IMAGE_NAME: paul-go

jobs:
  assemble:
    runs-on: ubuntu-latest
    if: github.event_name == 'push'
    steps:
    - uses: actions/checkout@v2
    - name: Login to github docker Registry
      run: docker login ghcr.io -u dylanturn -p ${{ secrets.GITHUB_TOKEN }}
    - name: Set the image repo name and tag
      id: image_vars
      run: |
        # Construct an image id and includes the repo.
        IMAGE_ID=ghcr.io/${{ github.repository }}/$IMAGE_NAME
        # Strip git ref prefix from version.
        VERSION=$(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" == "main" ] && VERSION=latest

        # Set variables that can be used in other steps.
        echo ::set-output name=repo::$(echo $IMAGE_ID | awk '{print tolower($0)}')
        echo ::set-output name=tag::$(echo $VERSION | awk '{print tolower($0)}')

    - name: Build the Docker image
      run: docker build . --file Dockerfile --tag ${{steps.image_vars.outputs.repo}}:${{steps.image_vars.outputs.tag}}

    - name: Push the Docker image
      run: docker push ${{steps.image_vars.outputs.repo}}:${{steps.image_vars.outputs.tag}}