Adding SSH public keys

By using the package gluon-authorized-keys it is possible to add SSH public keys to an image to permit root login.

If you select this package, add a list of authorized keys to site.conf like this::

{
  authorized_keys = { 'ssh-rsa AAA.... user1@host',
                      'ssh-rsa AAA.... user2@host },
  hostname_prefix = ...
  ...

Existing keys in /etc/dropbear/authorized_keys will be preserved.