Change Hostname in Container

[achmet9948]

Summary

At the moment the hostname in the container are called "localhost"
It it possible to use the serverhostname?

Motivation

For logging via syslog it would be great, to use the correct hostname and not the name "localhost"

Additional context

No response

[patschi]

Ideally, when accepted, this long-standing topic gets closed with PR #6778.