[bug#54293] [WIP] home: Add home-git-service-type

[Ludovic Courtès]

Hi 宋文武,

iyzsong@outlook.com skribis:

> * gnu/home/services/git.scm: New file.
> * gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

It’s been a while already but I think it’d be a nice addition.  I think
Maxime raised good points while reviewing, in particular regarding
naming conventions (lowercase and without dots) and possible grouping
(all the ‘user.’ options might fit in a single <git-user> record or
similar?).

How do you feel about making hopefully final changes so you can push it?

Thanks in advance!  :-)

Ludo’.