syslog-group not existing in Ubuntu 22.04 minimal

[rndmh3ro]

We set the group for the /var/log-dir to syslog, but on ubuntu 22.04 (and possibly others) there is no syslog-group by default.

[evilr00t]

quick solution would be to set:
os_mnt_var_log_group: "root" in the group/host_vars