In Scylla, we don't merge our PR but use ./script/pull_github_pr.shto close the pull request, addingcloses scylladb/scylladb remark and push changes tonext` branch.
One of the conditions for opening a backport PR is that all relevant commits are in master (passed gating), in this GitHub action, we will go through the list of commits once a push was made to master and will identify the relevant PR, and add promoted label to it. This will allow Mergify to start the process of backporting