fix(build): don't run the size label on forks (#1391)
fix(build): don't run the size label on forks (#1391)

* port from server

* Update pull_request_checks.yml
Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client