The gluon-authorized-keys is usually installed to use SSH keys to
authenticate a user against the device. To make this useful, it is also
required to disable passwordless SSH access to the device.

This new dependency is only required when the user doesn't have
gluon-setup-mode enabled already.

Fixes: #1777
Reported-by: yanosz <github@yanosz.net>
Fixes: a753fa79 ("gluon-authorized-keys: add keys from site.conf")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
(cherry picked from commit 2eb15bac)

This package will run as invariant script after each upgrade and copy
all keys from site.conf's authorized_keys entry to
/etc/dropbear/authorized_keys.

Existing keys will be preserved.

The site.conf entry 'authorized_keys' is required (if this package is
selected) and must contain a list of strings, each representing a line
of the resulting file.