You just append them to the git user’s authorized_keys file in its .ssh director

You just append them to the git user’s authorized_keys file in its .ssh directory:

$ cat /tmp/id_rsa.john.pub >> ~/.ssh/authorized_keys $ cat /tmp/id_rsa.josie.pub >> ~/.ssh/authorized_keys $ cat /tmp/id_rsa.jessica.pub >> ~/.ssh/authorized_keys