release.yml

name: Release
on:
  pull_request:
    types:
      - closed
    branches: [ "main" ]
#  workflow_dispatch:

jobs:
  release_draft:
    if: ${{ github.event.pull_request.merged && github.head_ref == 'github-actions-update' }}
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
      - name: TZ version
        run:  echo "TZ_VERSION=$(cat gen/version)" >> "${GITHUB_ENV}"
      - name: Latest release version
        env:
          GH_TOKEN: ${{ github.token }}
        run:  echo "CURRENT_LATEST_TAG=$(gh release list --limit 1 --exclude-drafts --exclude-pre-releases --json tagName --jq '.[].tagName')" >> "${GITHUB_ENV}"
      - name: Create tag
        run: |
          set -eux
          PREFIX=$(echo "${CURRENT_LATEST_TAG}" | sed -e 's|-.*$||g')
          if [ "${PREFIX}" = "" ]; then
            PREFIX="v1.0.0"
          fi
          NEW_TAG="${PREFIX}-${TZ_VERSION}"
          
          git config --global user.name 'GitHub Actions Release'
          git config --global user.email 'github.actions.release@example.com'
          git tag -a -m "Update (${TZ_VERSION})" "${NEW_TAG}"
          git push --tags

          echo "NEW_TAG=${NEW_TAG}" >> "${GITHUB_ENV}"
      - name: Draft release
        env:
          GH_TOKEN: ${{ github.token }}
        run: gh release create --draft --latest --generate-notes --title "${NEW_TAG}" "${NEW_TAG}"