Fix unassigned ciflow trigger (#65354)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/65250#issuecomment-923120764
this is a limitation of github action triggers, it's hard to introduce condition before the workflow, that's why we intentionally pick the rare event ("unassigned"). The fix I think for people didn't opt-in ciflow and manually unassign, is to run all the CI (otherwise we introduce new condition on this and not worth to make things even complex).
`unassigned` event payload looks like this, just to make sure `github.event.assignee.login` is pointing to the right location.
```
{
"action": "unassigned",
"assignee": {
"avatar_url": "https://avatars.githubusercontent.com/u/658840?v=4",
"events_url": "https://api.github.com/users/zhouzhuojie/events{/privacy}",
"followers_url": "https://api.github.com/users/zhouzhuojie/followers",
"following_url": "https://api.github.com/users/zhouzhuojie/following{/other_user}",
"gists_url": "https://api.github.com/users/zhouzhuojie/gists{/gist_id}",
"gravatar_id": "",
"html_url": "https://github.com/zhouzhuojie",
"id": 658840,
"login": "zhouzhuojie",
"node_id": "MDQ6VXNlcjY1ODg0MA==",
"organizations_url": "https://api.github.com/users/zhouzhuojie/orgs",
"received_events_url": "https://api.github.com/users/zhouzhuojie/received_events",
"repos_url": "https://api.github.com/users/zhouzhuojie/repos",
"site_admin": false,
"starred_url": "https://api.github.com/users/zhouzhuojie/starred{/owner}{/repo}",
"subscriptions_url": "https://api.github.com/users/zhouzhuojie/subscriptions",
"type": "User",
"url": "https://api.github.com/users/zhouzhuojie"
},
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65354
Reviewed By: malfet, seemethere, janeyx99
Differential Revision: D31060212
Pulled By: zhouzhuojie
fbshipit-source-id: ce815cc96e8a00016646d6f02f0917169fa652dc