User and group warnings during ISPConfig update
The following warnings are shown during update on Debian 12:
Reconfigure Services? (yes,no,selected) [yes]:
......
Configuring Rspamd
usermod: group 'amavis' does not exist
......
Create new ISPConfig SSL certificate (yes,no) [no]:
adduser: The user `www-data' is already a member of `ispconfig'.
adduser: The user `www-data' is already a member of `ispapps'.