Add configuration parsing

[ByteOtter]

What does this PR change?

There are at least two variables that users need to be able to configure when using netbox-sync:

• The URI of their netbox API endpoints
• The authentication token for the API

This PR implements the first stage of adding the ability to configure the program by using a .nbs-config.toml file.

This file will be located in etc/opt/.nb-config.toml and at least consist of the following:

[netbox]
netbox_auth_token = "<authentication token>"
netbox_uri = "<http uri to netbox instance>"

Tick the applicable box:

• Add new feature
• Security changes
• Tests
• Documentation changed

• General Maintenance

Links

Tracks: #21

• DONE

Documentation

• Documentation provided by buildable docstrings.

• DONE

[ByteOtter]

This is done as far as possible. It will be touched again for work on #22 though as taking config parameters from the cli is mandatory if the config file is empty.

Also, as this feature mainly relies on file system operations and other parts of the program, I do not think that writing unittests is very advisable.
We should cover this with integrations tests as laid out in #23 .

[SchoolGuy]

I would have implemented it differently but the code you wrote is fine and as such this PR is LGTM.

[ByteOtter]

I would have implemented it differently but the code you wrote is fine and as such this PR is LGTM.

Thanks for your review!
I'd be happy to hear your thoughts about the implementations when you have the time :)