9272873cf8
Since the target branch was in a different repository, the action failed since it couldn't find the reference. The code here is based on a recent change in Pronto [1] and with a comparison between the repo.url property of pull_request.head and pull_request.base to determine if the pull request was created from a forked repository [1] https://github.com/prontolabs/pronto/commit/4fe28418b6