Summary: Either Phab differential or Gerrit (to be installed) but not sure what to use.
Test Plan: `arc patch`, verify lint works and connects to this instance.
Reviewers: #acl_sudoers, #blessed_reviewers, revi
Reviewed By: #acl_sudoers, #blessed_reviewers, revi
Differential Revision: https://issuetracker.revi.xyz/D7