Permit loading settings from a designated external module

[jeremystretch]

NetBox version

v4.0.1

Feature type

New functionality

Proposed functionality

Extend settings.py to load arbitrary settings from a designated external module (local_settings.py), if it exists, and set settings._UNSUPPORTED_SETTINGS to true, indicating the use of unsupported settings.

Use case

This will permit an administrator to extend or override NetBox's core settings without needing to modify the core code base.

As we (the maintainers) cannot predict what changes may be made by an external module, modification to the core settings is entirely unsupported. If in use, users will need to remove local_settings.py and re-test for any suspect behavior prior to submitting a bug report.

Database changes

None

External dependencies

None