This action also works on merged pull requests. Before, $files_modified
was empty on merged pull requests and the workflow failed

Only .changes files are passed to this script by the get-changed-files
action.

The automation to create comments doesn't work on the pull_request hook
for forks due to permissions. According to the docs, the right hook to
use is pull_request_target instead.

Co-authored-by: Etheryte <[email protected]>