release-tag.yml

# Create a GitHub release whenever a tag is pushed.
# Tags that aren't in the form N.N.N are considered pre-releases.

name: release-tag
on:
  push:
    tags:
      - "**"

jobs:
  create-release:
    runs-on: ubuntu-22.04
    permissions:
      contents: write
    steps:
      # https://github.com/actions/github-script
      # https://octokit.github.io/rest.js/v18#repos-create-release
      - uses: actions/github-script@v7
        with:
          script: |
            if (!context.ref.startsWith('refs/tags/')) {
              core.setFailed(`${context.ref} is not in the form refs/tags/$tag`)
            }
            const tag = context.ref.slice(10)
            const prerelease = !tag.match(/\d+\.\d+\.\d+$/)
            github.rest.repos.createRelease({
              owner: context.repo.owner,
              repo: context.repo.repo,
              tag_name: tag,
              prerelease: prerelease,
              body: 'Please see the [changelog](https://zero-to-jupyterhub.readthedocs.io/en/latest/changelog.html) for details.'
            });