According to the operating-system-file fileld of
unattended-upgrade-configuration in the manual, automatic updates
don't work when "/run/current-system/configuration.scm [...] refers to
extra files (SSH public keys, extra configuration files, etc.) via
local-file and similar constructs.".
So we need these files in the store and to point to them to make the
automatic updates work.
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>