Adding a config entry to use a specific git binary

[ghost]

Can be useful if working in an environment where the installed git is an older version, using a new config entry would allow us to compile our version of git that is compatible and use it.

[stefanhaller]

This doesn't need a config entry. Lazygit will use the first git that it finds in PATH, so just set your PATH so that your own compiled version comes before the system one. E.g. export PATH=$HOME/bin:$PATH, assuming you compiled git into $HOME/bin.