Enable PyTorch Probot as a GitHub Action. (#28879)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28879
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D18231741
Pulled By: ezyang
fbshipit-source-id: d49711ad41d7ff7e527326c68fd8db86da10a818
