And in auth_ssh, verify that the user is allowed to connect to that server, then look it up on github (my public keys: https://github.com/withinboredom.keys).
If you want to allow any github user you allow to connect various permissions, check out libnss-ato.
These are all 1 or 2 lines of configuration and are not hard. You just have to know they exist.
FWIW, setting up something like tailscale is remarkably simple (I'm using PHP here to keep it simple):
In sshd_config:
And in auth_ssh, verify that the user is allowed to connect to that server, then look it up on github (my public keys: https://github.com/withinboredom.keys).If you want to allow any github user you allow to connect various permissions, check out libnss-ato.
These are all 1 or 2 lines of configuration and are not hard. You just have to know they exist.