Thanks for writing this action! I have been trying out the github merge queue beta but it is not yet usable (for us), and auto-merge together with this seems to provide a much better workflow.

One thing I noticed is that rebases will happen even if branches are already up to date, changing commit hashes and triggering extra CI runs unnecessarily. The impact is not so bad as our CI will either abort the older builds, or they will fail because the commit hashes are now missing.

Still, it would be nice if the rebases did not happen if the branch is already up to date.