create_release_pr.yaml

---
name: Create PR to prepare for Release

on:
  workflow_dispatch:
    inputs:
      version_bump_part:
        type: choice
        description: 'version bump part'
        default: minor
        options:
          - patch
          - minor
          - major
        required: true
      # Although I can use https://github.com/f3ath/cider#changelog, I don't describe edax_runner CHANGELOG with large text and I decided to implement simple workflow.
      changelog_description:
        type: string
        description: 'description for CHANGELOG'
        default: 'upgrade dependencies.'
        required: true

jobs:
  create_release_pr:
    runs-on: ubuntu-latest
    timeout-minutes: 20

    steps:
      - uses: actions/checkout@v3

      - uses: dart-lang/setup-dart@v1

      - name: bump version
        run: dart run cider bump ${{ github.event.inputs.version_bump_part }}

      - name: inject current version
        run: echo "CURRENT_VERSION=$(dart run cider version)" >> $GITHUB_ENV

      - name: update CHANGELOG
        run: |
          TMP_FILE="CHANGELOG.md.tmp"
          echo "# ${{ env.CURRENT_VERSION }}" >> "${TMP_FILE}"
          echo "" >> "${TMP_FILE}"
          echo "${{ github.event.inputs.changelog_description }}" >> "${TMP_FILE}"
          echo "" >> "${TMP_FILE}"

          cat CHANGELOG.md >> "${TMP_FILE}"
          cat "${TMP_FILE}" > CHANGELOG.md
          rm "${TMP_FILE}"

      # See: https://github.com/peter-evans/create-pull-request/tree/master#reference-example
      - name: create PR
        id: create_pull_request
        uses: peter-evans/create-pull-request@v5
        with:
          # See: https://github.com/peter-evans/create-pull-request/blob/master/docs/concepts-guidelines.md#triggering-further-workflow-runs
          # See: https://github.com/peter-evans/create-pull-request/issues/48#issuecomment-537478081
          token: ${{ secrets.PAT }}
          # See: https://github.com/peter-evans/create-pull-request/issues/593
          committer: GitHub <noreply@github.com>
          author: ${{ github.actor }} <${{ github.actor }}@users.noreply.github.com>
          commit-message: 'Prepare for new Release ${{ env.CURRENT_VERSION }}'
          title: 'Prepare for new Release `${{ env.CURRENT_VERSION }}`'
          body: |
            Auto-generated by [create-pull-request](https://github.com/peter-evans/create-pull-request)

            ---
            See: https://github.com/peter-evans/create-pull-request/blob/master/docs/concepts-guidelines.md#triggering-further-workflow-runs
          branch: prepare_for_release
          delete-branch: true

      # See: https://github.com/peter-evans/create-pull-request/tree/main#auto-merge
      - name: enable auto-merge
        if: steps.create_pull_request.outputs.pull-request-operation == 'created'
        uses: peter-evans/enable-pull-request-automerge@v3
        with:
          token: ${{ secrets.PAT }}
          pull-request-number: ${{ steps.create_pull_request.outputs.pull-request-number }}
          merge-method: squash