[Bug]: Server Docker image fails because of `Unable to locate package software-properties-common`

[peterschmidt85]

Problem:

• The python:3.11-slim tag is a moving target. It always points to the "latest slim" version of the image.
  ( Recently, the official Python Docker images were updated. The underlying operating system for python:3.11-slim was upgraded from Debian 12 (codename "Bookworm") to Debian 13 (codename "Trixie").
  ( The package software-properties-common is not available in the default package repositories for the minimal "Trixie" installation used in the slim image, hence the error E: Unable to locate package software-properties-common.

Solution:

• If software-properties-common is not needed, remove it.