build: :construction_worker: add nix flake

[SophiaH67]

A nix flake for the rust linux app

[coderabbitai[bot]]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment

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[Keyruu]

LGTM and works on my machine!

[kavishdevar]

haha got 3 PRs just for this, I really need to give nix a try. anyway, thank you!