Add Assume-Unchaged to the file right click menu when commiting changes

The feature request

When using dynamic fonts in Text Mesh Pro in Unity the font asset generates git changes every time you press play in the unity editor which is annoying.

At the moment there's only ignore-file and ignore-folder in the right click menu in github desktop which doesn't stop the file from generating changes if it already exists in the repo and we do want the file to exist for everyone working on the project, just ignore the changes during runtime.

Proposed solution

Add Assume-Unchanged as a right click menu option in github desktop.

This command works exactly how I want it but I have to run it from command line instead of the nice gui app

Even better if this setting could be synced across every machine as well.

Additional context

No response