When using

Merge when ready

with the merge queue it waits with rebasing a pull request until the build has succeeded. This seems like a reasonable conservative choice but it would be nice to be able to tell it to rebase as soon as it sees that the PR is out of date with main so that if all the tests are going to pass it will be ready to merge sooner rather than later (i.e., having to wait for only one set of tests to run instead of two)