[Feature] Nix Flake

[Mast3rwaf1z]

Added a nix flake, i have 3 things i'd like to test out with this, what is in this PR atm is just some things from #272 and some things from f-klubben/fnix#2

What i would like this flake to also do is to run the system by just calling nix run github:f-klubben/stregsystemet

The devshell should actually already be usable by running nix develop github:Mast3rwaf1z/stregsystemet

• Implement a devshell
• Implement some way to ensure package version
• Create default package

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.20%. Comparing base (294159e) to head (e7c9a00).
Report is 13 commits behind head on next.

❗ Current head e7c9a00 differs from pull request most recent head 44b6b7f

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Additional details and impacted files

@@             Coverage Diff             @@
##             next     #459       +/-   ##
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+ Coverage   53.49%   81.20%   +27.70%     
===========================================
  Files          33       33               
  Lines        4621     3107     -1514     
  Branches      274      377      +103     
===========================================
+ Hits         2472     2523       +51     
+ Misses       2097      545     -1552     
+ Partials       52       39       -13     

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[Mast3rwaf1z]

Still not done at all, the default package does not want to link the python packages properly, and as such the python path only works while working with the devshell

but to be fair, you wouldn't use a flake-based default package in a server side program without the devshell if its available? hmm

[Mast3rwaf1z]

it should work still, without the comments :)