Does not work with `merge_group` trigger

[lalten]

merge_group is the trigger used for the Merge Queue feature.

See

• https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-a-merge-queue
• https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#merge_group
• https://docs.github.com/en/webhooks-and-events/webhooks/webhook-events-and-payloads#merge_group

steps.find_pr.outputs.pr will be empty

[lalten]

See https://github.com/community/community/discussions/46757#discussioncomment-5249568 for a way to make this work