[GITHUB] Auto-release new TYPO3 extensions from github to TER

By the way, this works much easier than you might think:

1) First of all, you should login on extensions.typo3.org and create some access token (API Token) to use the new REST API of typo3.org to publish your extensions (see https://github.com/TYPO3/tailor#prerequisites)

2) After that you can add three secret tokens in your github repository (see https://docs.github.com/en/free-pro-team@latest/actions/reference/encrypted-secrets#creating-encrypted-secrets-for-an-environment for details):

TYPO3_API_USERNAME (your username for FE-login on typo3.org)
TYPO3_API_PASSWORD (your password for FE-login on typo3.org)
TYPO3_API_TOKEN (see 1 above)

Those secrets can be used as environment variable now.

3) Just add .github/workflows/ter-release.yml (see below) to your repository. Update line 13 and 14 with your configuration.

4) Done :)

ter-release.yml:

name: TER release

on:
  push:
    tags:
      - '*'

jobs:
  ter-release:
    name: TER release
    runs-on: ubuntu-latest
    env:
      TYPO3_EXTENSION_KEY: 'lux'
      REPOSITORY_URL: 'https://github.com/in2code-de/lux'
      TYPO3_API_TOKEN: ${{ secrets.TYPO3_API_TOKEN }}
      TYPO3_API_USERNAME: ${{ secrets.TYPO3_API_USERNAME }}
      TYPO3_API_PASSWORD: ${{ secrets.TYPO3_API_PASSWORD }}

    steps:
      - name: Get the version
        id: get_version
        run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}

      - name: Setup PHP
        uses: shivammathur/setup-php@v2
        with:
          php-version: '7.4'
          extensions: intl, mbstring, xml, soap, zip, curl

      - name: Install EXT:tailor
        run: composer global require typo3/tailor --prefer-dist --no-progress --no-suggest

      - name: Upload EXT:${{ env.EXTENSION_KEY }} as ${{ steps.get_version.outputs.VERSION }} to TER
        run: php ~/.composer/vendor/bin/tailor ter:publish ${{ steps.get_version.outputs.VERSION }} --artefact=${{ env.REPOSITORY_URL }}/archive/${{ steps.get_version.outputs.VERSION }}.zip --comment="New release of version ${{ steps.get_version.outputs.VERSION }} - see details, changelog and documentation on ${{ env.REPOSITORY_URL }}"

Inspired from:
https://github.com/TYPO3/tailor/blob/main/README.md
https://www.felixnagel.com/blog/artikel/2020/06/23/automated-typo3-ter-releases-using-github-actions/

Used (e.g.) in extension lux:

https://github.com/in2code-de/lux