nixos: add 'firebird' group

The firebird module complains without missing 'firebird' group, add it.

Changed files
+3
nixos
modules
misc
services
databases
+1
nixos/modules/misc/ids.nix
···
teamspeak = 124;
influxdb = 125;
nsd = 126;
+
firebird = 127;
znc = 128;
# When adding a gid, make sure it doesn't match an existing uid. And don't use gids above 399!
+2
nixos/modules/services/databases/firebird.nix
···
uid = config.ids.uids.firebird;
};
+
users.extraGroups.firebird.gid = config.ids.gids.firebird;
+
};
}