Script to rebase with formatting

[infinisil]

So we don't forget about it, @grahamc created a neat script to rebase with formatting: https://github.com/grahamc/git-rebase-format

This could be useful as a Nixpkgs maintainer script, so people can easily rebase their PRs when we mass-apply the new formatting.

[dasJ]

We might be able to adapt this: https://stackoverflow.com/a/71812873

[nixos-discourse]

This issue has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/formatting-team-meeting-2024-11-26/56643/1

[infinisil]

Did something close to the SO post in NixOS/nixpkgs#363759, but it turns out it doesn't always work, WIP for now.