milestone.yml

name: Add milestone on PR merge

on:
  pull_request:
    branches:
      - main
    types:
      - closed

permissions: {}

jobs:
  add-milestone:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - name: Get open milestone
        id: milestone
        run: |
          milestone=$(gh api repos/${{ github.repository }}/milestones \
            --jq '.[] | select(.state=="open") | .title' | head -n 1)
          echo "Found milestone: $milestone"
          echo "milestone=$milestone" >> "$GITHUB_OUTPUT"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Add milestone to PR
        if: steps.milestone.outputs.milestone != ''
        run: |
          gh pr edit ${{ github.event.pull_request.number }} \
            --repo ${{ github.repository }} \
            --milestone "${STEPS_MILESTONE_OUTPUTS_MILESTONE}"
        env:
          STEPS_MILESTONE_OUTPUTS_MILESTONE: ${{ steps.milestone.outputs.milestone }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}