pr_assign_milestone.yml

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name: Assign Milestone to pull request
on:
  pull_request_target:
    types:
      - closed

jobs:
  assign:
    name: Add milestone to closed PR
    runs-on: ubuntu-latest
    if: github.event.pull_request.merged
    steps:
      - name: add milestone
        uses: actions/github-script@v7
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            github.rest.issues.update({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              milestone: null
            });