With the latest changes to the release process, we now have official release/* branches in this repo. It'll be beneficial to maintain a release/* branch with changes from the nightly branch during a release month.

The action should:

• Cherry pick the PR commit / apply the PR as a patch
• Regenerate Dockerfiles and Readmes
• Submit a pull request to the target branch.
• Have some way of notifying the requestor if regenerating Dockerfiles/Readmes from templates failed.

Prior art from the dotnet-monitor repo: https://github.com/dotnet/dotnet-monitor/tree/main/eng/actions/backport