I suggest to improve installation documentation, and provide additional optional official dockerhub containers (built on base image Debian) separate for running netxms server, netxms webui etc.
of course for database just use existing mariadb container.
And update installation documentation.

This will provide much easier deployment, official one, updated and maintained

I concur, this is the way to go. I'm going to ask the NetXMS team for their input. The company I work for has a support contract. Upgrades would be so simple if we could get this.

https://github.com/netxms/docker/