Prepare release PR workflow (Diaoul/subliminal)

name: Prepare release PR
 
on:
  workflow_dispatch:
    inputs:
      branch:
        description: 'Branch to base the release from'
        required: false
        default: 'main'
      bump:
        description: |
          'Release type: major, minor or patch. '
          'Leave empty for autommatic detection based on changelog segments.'
        required: false
        default: ''
      prerelease:
        description: 'Prerelease (ex: rc1). Leave empty if not a pre-release.'
        required: false
        default: ''
 
env:
  FORCE_COLOR: "1"
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    permissions:
      contents: write
      pull-requests: write
 
    steps:
    - uses: actions/checkout@v7
      with:
        fetch-depth: 0
        # persist-credentials is needed in order for us to push the release branch.
        persist-credentials: true
 
    - name: Set up Python
      uses: actions/setup-python@v6
      with:
        python-version-file: .python-version-default
        cache: pip
 
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install --upgrade setuptools tox
 
    - name: Prepare release PR
      env:
        BRANCH: ${{ github.event.inputs.branch }}
        BUMP: ${{ github.event.inputs.bump }}
        PRERELEASE: ${{ github.event.inputs.prerelease }}
        GH_TOKEN: ${{ github.token }}
      run: |
        git config user.name 'github-actions[bot]'
        git config user.email '41898282+github-actions[bot]@users.noreply.github.com'
        tox -e prepare-release-pr -- ${BRANCH} --bump=${BUMP} --prerelease=${PRERELEASE}