name: Publish master image

on:
  push:
    branches:
    - master
  schedule:
  # Every Sunday, create a new version, to make sure we use an up-to-date base image, etc
  - cron: '0 0 * * 0'

jobs:
  publish_image:
    name: Publish master image
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v7
    - name: Build
      run: |
        GITHUB_REPOSITORY_LC=$(echo "${GITHUB_REPOSITORY}" | tr [A-Z] [a-z])
        docker build -t docker.pkg.github.com/${GITHUB_REPOSITORY_LC}/master:latest .
    - name: Publish
      run: |
        GITHUB_REPOSITORY_LC=$(echo "${GITHUB_REPOSITORY}" | tr [A-Z] [a-z])
        docker login docker.pkg.github.com -u publisher -p "${GITHUB_TOKEN}"
        docker push docker.pkg.github.com/${GITHUB_REPOSITORY_LC}/master:latest
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}