add PR fork workable (#13438)
* add PR fork workable
* Apply suggestion from @paulinebm
* Apply suggestion from @paulinebm
* Apply suggestion from @yiyixuxu
Co-authored-by: YiYi Xu <yixu310@gmail.com>
* Apply suggestions from code review
Co-authored-by: Pauline Bailly-Masson <155966238+paulinebm@users.noreply.github.com>
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: YiYi Xu <yixu310@gmail.com>
