chore(ci): add nix flake build

[ch4og]

Description of change

Adds flake building to CI

Help is needed to add rust-cache support

[ch4og]

AFAIK pkgs.rustPlatform.buildRustPackage can't use rust-cache so I have no idea what can be done

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 3.33%. Comparing base (4bc6b7a) to head (b998cde).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #75   +/-   ##
=====================================
  Coverage   3.33%   3.33%           
=====================================
  Files         19      19           
  Lines       2407    2407           
=====================================
  Hits          80      80           
  Misses      2327    2327           

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[orhun]

Maybe @jla2000 or @Titaniumtown has an idea about this

[jla2000]

@ch4og I think you will need to cache the nix store.

[Titaniumtown]

Maybe @jla2000 or @Titaniumtown has an idea about this

I'm not too familiar with using nix with github actions, srry :(

[ch4og]

@ch4og I think you will need to cache the nix store.

Doesn't nix magic cache do this?

[ch4og]

Should be good to merge

Caching nix store using other way worked. It uses cache after first build now

But this build time can be decreased even more with #76

[orhun]

Awesome, thanks guys!