release_pr_workflow.yml

# The workflow to create PRs with release commits.
name: Create release PR
on:
  workflow_dispatch:
    inputs:
      release_version:
        description: "Release version '0.1.2' (without 'v')"
        required: true
      snapshot_version:
        description: "Snapshot version '0.2.0-SNAPSHOT' (without 'v')"
        required: true

jobs:
  create_release_pr:
    name: Create release PR (job)
    runs-on: ubuntu-latest
    steps:
      - name: Check versions
        run: |
          echo "Checking release version..."
          if echo ${{ github.event.inputs.release_version }} | grep --invert-match '^[0-9]\+\.[0-9]\+\.[0-9]\+$' > /dev/null; then
            echo "Release version is invalid"
            exit 1
          fi

          echo "Checking snapshot version..."
          if echo ${{ github.event.inputs.snapshot_version }} | grep --invert-match '^[0-9]\+\.[0-9]\+\.[0-9]\+-SNAPSHOT$' > /dev/null; then
            echo "Snapshot version is invalid"
            exit 1
          fi

      - name: Checkout master
        uses: actions/checkout@v2
        with:
          ref: master
          fetch-depth: 0

      - name: Create release commits
        run: |
          git config --local user.name "GitHub Action"
          git config --local user.email "action@github.com"
          sed -i -e "s/^version=.\+$/version=${{ github.event.inputs.release_version }}/g" gradle.properties
          git add gradle.properties
          git commit -m "Release version ${{ github.event.inputs.release_version }}"
          sed -i -e "s/^version=.\+$/version=${{ github.event.inputs.snapshot_version }}/g" gradle.properties
          git add gradle.properties
          git commit -m "Bump version to ${{ github.event.inputs.snapshot_version }}"

      - name: Create Pull Request
        uses: peter-evans/create-pull-request@v3
        with:
          branch: release-${{ github.event.inputs.release_version }}
          delete-branch: true
          draft: true
          title: Release version ${{ github.event.inputs.release_version }}
          body: |
            Proposed changelog:
              - *fill in*