I believe you could do that yes, but I don't think it's recommended. My understanding is that git itself offers no real solutions to the questions of key-manag

I believe you could do that yes, but I don't think it's recommended. My understanding is that git itself offers no real solutions to the questions of key-management, especially revocation and rotation, so you're essentially on your own for all of that. Revocation seems especially tricky as it seems directly at odds with git's model of immutable commits. I don't know if there's a robust solution out there.