publish_master.yml

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
    - cron: '0 0 * * 0'

jobs:
  publish_image:
    name: Publish master image
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read
    steps:
    - uses: actions/checkout@v4

    - name: Set lowercase repository name
      run: echo "GITHUB_REPOSITORY_LC=$(echo ${GITHUB_REPOSITORY} | tr [A-Z] [a-z])" >> $GITHUB_ENV

    - name: Build Docker image
      run: |
        docker build -t docker.pkg.github.com/${GITHUB_REPOSITORY_LC}/master:latest .

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

    - name: Push Docker image
      run: |
        docker push docker.pkg.github.com/${GITHUB_REPOSITORY_LC}/master:latest
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}