branch-names/.github/workflows/rebase.yml

name: Automatic Rebase
on:
  issue_comment:
    types: [created]
jobs:
  rebase:
    name: Rebase
    if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/rebase')
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2.3.4
        with:
          token: ${{ secrets.PAT_TOKEN }}
          fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
      - name: Automatic Rebase
        uses: cirrus-actions/rebase@1.4
        env:
          GITHUB_TOKEN: ${{ secrets.PAT_TOKEN }}