sync.yml

# .github/workflows/example.yml

name: Merge upstream branches
on:
  schedule:
     # Every day at 3:18am
    - cron:  '18 3 * * *'
jobs:
  merge:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Merge upstream
        run: |
          git config --global user.name 'SAIR Bot'
          git config --global user.email 'admin@sairlab.org'

          # "git checkout master" is unnecessary, already here by default
          git pull --unshallow  # this option is very important, you would get
                                # complains about unrelated histories without it.
                                # (but actions/checkout@v2 can also be instructed
                                # to fetch all git depth right from the start)

          git remote add upstream https://github.com/leggedrobotics/iPlanner.git
          git fetch upstream

          # Neither forget the -b opt,
          # remember to change branch name such as "master" or "main"
          git merge --no-edit upstream/master
          git push origin master