2023
https://garrit.xyz/posts/2023-10-13-organizing-multiple-git-identities

~/.gitconfig
[user]
    name = Garrit Franke
    email = garrit@slashdev.space
[includeIf "gitdir:~/work/"]
    path = ~/.gitconfig-work
[includeIf "gitdir:~/work/client2/"]
    path = ~/.gitconfig-client2
[includeIf "gitdir:~/sources/"]
    path = ~/.gitconfig-personal

~/.gitconfig-work
[user]
    name = Garrit Franke
    signingkey = 12345678
    email = garrit@work.de
[commit]
    gpgsign = true