Don't publish Netbox on random port

[tobiasge]

Related Issue:

New Behavior

• Netbox UI is not accessible on a random port.

This improves on PR #407 with an added example file for the docker-compose.override.yml to make it as easy as possible for new users to get an instance of Netbox running. Thanks to @centum for the initial PR.

Contrast to Current Behavior

• Netbox can be accessed on a random port from outside of the server it is running on.

Discussion: Benefits and Drawbacks

• See PR improve configure publish ports #407

Changes to the Wiki

• None

Proposed Release Note Entry

• Netbox is not published on a random port anymore. The port configuration must be set in the docker-compose.override.yml file.

Double Check

• I have read the comments and followed the PR template.
• I have explained my PR according to the information in the comments.
• My PR targets the develop branch.