Add Nix flake and Home Manager module

[Bircoder432]

Hello!
I thought packaging rustormy for Nix would be useful. This PR adds:

• A basic flake for the x86_64-linux target using Naersk to build the Rust package.
• A Home Manager module, which allows installing rustormy and configuring it via ~/.config/rustormy/config.toml. Default settings are applied automatically but can be overridden by the user.

Cargo.lock:

• Cargo.lock was removed from .gitignore because Naersk requires a Cargo.lock for deterministic builds. Without it, builds could vary depending on the latest versions of dependencies. Including Cargo.lock ensures reproducible packaging for Nix.

Example usage with NixOS + Home Manager:

# flake.nix
{
  inputs = {
    rustormy.url = "github:Tairesh/rustormy";
  };

  outputs = { ... }@inputs:
  {
    nixosConfigurations = {
      vstorpc = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        specialArgs = { inherit inputs; };
        modules = [
          home-manager.nixosModules.home-manager
          (inputs.rustormy.homeManagerModules.rustormy)
        ];
      };
    };
  };
}

# home.nix
{ pkgs, inputs, ... }:

{
  programs.rustormy = {
    enable = true;
    package = inputs.rustormy.packages.x86_64-linux.default;
    settings = {
      city = "London";
      # other options can be overridden as desired
    };
  };
}

[gemini-code-assist]

Summary of Changes

Hello @Bircoder432, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the rustormy project's ecosystem by integrating it with Nix, a powerful package manager. It provides a robust framework for reproducible builds and simplifies installation and configuration for users within the Nix environment, particularly through Home Manager.

Highlights

• Nix Flake Integration: Introduces a Nix flake to enable easy packaging and building of rustormy for x86_64-linux systems, leveraging Naersk for Rust project compilation.
• Home Manager Module: Adds a Home Manager module, allowing users to install rustormy and manage its configuration via ~/.config/rustormy/config.toml with automatic default settings and user override capabilities.
• Reproducible Builds: Modifies .gitignore to include Cargo.lock, ensuring deterministic Rust builds within the Nix environment by explicitly tracking dependency versions.

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[gemini-code-assist]

Code Review

This pull request introduces Nix flake and Home Manager module support for rustormy, which is a great addition for Nix users. The changes include modifying .gitignore to allow Cargo.lock for deterministic builds with Naersk, and adding flake.nix, flake.lock, and home-manager/home.nix files. The flake.nix provides a basic flake for building the Rust package, and the Home Manager module allows easy installation and configuration. Overall, the implementation is well-structured, but there are a few areas for improvement regarding hardcoded values, consistency in configuration keys, and example syntax.