Draft new release workflow (ProjectQ-Framework/ProjectQ)

---
 
name: "Draft new release"
 
on:  # yamllint disable-line rule:truthy
  workflow_dispatch:
    inputs:
      tag:
        description: 'Tag to prepare (format: vXX.YY.ZZ)'
        required: true
jobs:
  new-release:
    timeout-minutes: 30
    name: "Draft a new release"
    runs-on: latchkey-small
    steps:
      - name: Install git-flow
        run: sudo apt update && sudo apt install -y git-flow
 
      - uses: actions/checkout@v3
 
      - name: Setup Python
        uses: actions/setup-python@v3
        with:
          python-version: '3.11'
          cache: 'pip'
          cache-dependency-path: '**/setup.cfg'
 
      - name: Configure git-flow
        run: |
          git fetch --tags --depth=1 origin master develop
          git flow init --default --tag v
 
      - name: Create release branch
        run: git flow release start ${{ github.event.inputs.tag }}
 
      - name: Initialize mandatory git config
        run: |
          git config user.name "GitHub actions"
          git config user.email noreply@github.com
 
      - name: Update CHANGELOG
        run: |
          python3 -m pip install mdformat-gfm 'git+https://github.com/Takishima/keepachangelog@v1.0.1'
          python3 -m keepachangelog release "${{ github.event.inputs.tag }}"
          python3 -m mdformat CHANGELOG.md
 
      - name: Commit changelog and manifest files
        id: make-commit
        run: |
          git add CHANGELOG.md
          git commit --message "Preparing release ${{ github.event.inputs.tag }}"
 
          echo "::set-output name=commit::$(git rev-parse HEAD)"
 
      - name: Push new branch
        run: git flow release publish ${{ github.event.inputs.tag }}
 
      # yamllint disable rule:line-length
      - name: Create pull request
        uses: thomaseizinger/create-pull-request@1.3.1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          head: release/${{ github.event.inputs.tag }}
          base: master
          title: Release version ${{ github.event.inputs.tag }}
          reviewers: ${{ github.actor }}
          # Write a nice message to the user.
          # We are claiming things here based on the `publish-new-release.yml` workflow.
          # You should obviously adopt it to say the truth depending on your release workflow :)
          body: |
            Hi @${{ github.actor }}!
 
            This PR was created in response to a manual trigger of the release workflow here: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}.
            I've updated the changelog and bumped the versions in the manifest files in this commit: ${{ steps.make-commit.outputs.commit }}.
 
            Merging this PR will create a GitHub release and upload any assets that are created as part of the release build.