CREATE_RELEASE_BRANCH.yml

name: Create release branch
run-name: Create release branch ${{ inputs.version }}

on:
  workflow_dispatch:
    inputs:
      version:
        description: 'Full semantic version number of the next minor release, e.g. 8.4.0'
        required: true

jobs:
  create-release-branch:
    name: Create release branch ${{ inputs.version }}
    runs-on: ubuntu-latest
    steps:

      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.inputs.branch }}
          fetch-depth: 0

      - name: Restore cache
        uses: actions/cache@v3
        with:
          path: ~/.m2/repository
          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
          restore-keys: |
            ${{ runner.os }}-maven-

      - name: Prepare Java and Maven settings
        uses: actions/setup-java@v3
        with:
          distribution: 'temurin'
          java-version: '17'

      - name: Configure git user
        run: |
          # https://github.com/actions/checkout/issues/13#issuecomment-724415212
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

      - name: Set snapshot version on release branch
        id: set-snapshot-version
        run: |
          MINOR_VERSION=${RELEASE_VERSION%.*}
          git checkout -b release/${MINOR_VERSION}
          mvn -B versions:set -DnewVersion=${RELEASE_VERSION}-SNAPSHOT -DgenerateBackupPoms=false -f parent
          git commit -am "ci: set next snapshot version"
          git push origin release/${MINOR_VERSION}
          git checkout -b temp:release/${RELEASE_VERSION%.*}
          echo "branchName=temp:release/${RELEASE_VERSION%.*}" >> $GITHUB_OUTPUT
        env:
          RELEASE_VERSION: ${{ github.event.inputs.version }}

      - name: Create pull request to main branch
        uses: peter-evans/create-pull-request@v5
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          branch: ${{ steps.set-snapshot-version.outputs.branchName }}
          commit-message: "ci: set next snapshot version"
          committer: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
          base: main
          title: "ci: set next snapshot version"
          body: |
            This PR sets the next snapshot version on the main branch.
            
            Checklist:
            - [ ] the PR should be accepted via the "Rebase and merge" option
            - [ ] the branch must **not** be deleted after merging
            - [ ] the PR contains exactly one commit with the version change
            
            If this PR has conflicts, re-run the `Create release branch` workflow. No need to close the PR or delete the branch.
        env:
          RELEASE_VERSION: ${{ github.event.inputs.version }}