.github/workflows/delete-bot-branches-trigger.yml

# Copyright 2013 The Flutter Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Unprivileged half of the bot branch cleanup.
#
# This workflow runs on `pull_request` with a read-only token and no access to
# secrets. When a `flutteractionsbot` pull request is closed, it records the
# pull request number in a `delete-branch-metadata` artifact so that the
# privileged `delete-bot-branches.yml` workflow can delete the head branch via
# `workflow_run`.

name: Delete Bot Branches Trigger

on:
  pull_request:
    types: [closed]
    branches:
      - master
      - 'flutter-*-candidate*'

permissions:
  contents: read

jobs:
  record:
    name: Record bot PR
    runs-on: ubuntu-latest
    # Evaluated before a runner is allocated, so non-bot PRs cost nothing.
    if: |
      github.repository == 'flutter/flutter' &&
      github.event.pull_request.head.repo != null &&
      github.event.pull_request.head.repo.owner.login == 'flutteractionsbot' &&
      github.event.pull_request.head.ref != 'master' &&
      github.event.pull_request.head.ref != 'main'
    steps:
      - name: Record PR number
        env:
          PR_NUMBER: ${{ github.event.pull_request.number }}
        run: |
          mkdir -p delete-branch-metadata
          jq -n --arg pr "$PR_NUMBER" '{pr_number: $pr}' > delete-branch-metadata/metadata.json

      - name: Upload metadata
        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
        with:
          name: delete-branch-metadata
          path: delete-branch-metadata/
          retention-days: 1
          if-no-files-found: error