Base image fixes (sec + compat)

[Oliver Bertuch]

The preparation to run the containers on OpenShift introduced an error in the base image: the USER payara statement after fixing the domain dir permissions is missing, so keeps user root.

In addition, to prepare for Ubuntu 24.04 we need to change:

1. netcat -> netcat-openbsd (avail in 22.04 and 24.04)
2. adduser -> useradd
3. addgroup -> groupadd

• Also, we make payara a system user, but use UID 1000, which is beyond the system user range. Let's fix that.
• In addition, we should adapt good practices and have a script to change the user password by env var/secret file, warning users they are using a default password and which that is
• Same for the Payara admin user password