Fails to report stats for PRs from a fork #2

Currently certain PR's coming from forks result in the action running in the context of the fork, which means it can't post a comment or a PR review to the PR/issue.

Possible workarounds:

1. Report the size table back using a Status Check
   • Not sure if GitHub's UI will handle this
   • Not sure if status checks have the same permissions issue
   • Not sure if status checks for the HEAD or merge commit on a PR show on the PR itself