AuthorizedKeysCommand - Provides a faster way to authenticate users by ssh protocol (recommended).
If you choose 'Yes', RocketGit will not generate the authorized_keys file anymore; instead, it will provide a helper to OpenSSH that will look-up directly in the database the fingerprint provided by the user.
See 'man sshd_config' for more info.
Before choosing 'Yes', you must append to /etc/ssh/sshd_config file the following lines (use tab key to indent):
Match User rocketgit
   AuthorizedKeysCommand /usr/sbin/rg_authorize %f
   AuthorizedKeysCommandUser rocketgit
   AuthenticationMethods publickey
Then, restart the ssh daemon.