Currently, this action setup the way documented in the recipes will only work for people pushing branches in the source repo. If someone forks the repo and opens a PR, the action will fail since it will have a read only github token (can't make PR comments). This can be solved by using the `pull_request_target` trigger, but that means the workflow will run in the context of the source repo (security risk). i _think_ if we ensure the jobs don't have such permissions, and only the diff job has the write permission, things will be ok