Better to be safe than sorry. My friend was in the civil service
too and wanted to be a part-time insurances agent. His warrant
office advise him not to as it is not allow.
And if your friend pays you,the authorities like ACRA will know
as there is lesser profit after paying you(*therefore lesser tax to
govt and etc)
In anyway, do anything but dun get caught. Mayb you can help
your fren awhile while not full-time