Secretive as system service for SSH host key

[martinpaljak]

sshd support HostKeyAgent that would allow to run the system SSH in a way where the host key is bound to the secure enclave. Currently it seems to be not possible to run things as root (tried, a clean UI pops up if run by sudo, but trying to create a key is blocked by security server).

Maybe related with the CLI topic, that it would be possible to create "silent" keys that require no auth and are usable without a UI.