add flake.nix

[anispwyn]

this flake allow you to do the following

• be able to run repak-gui by simply run nix run github:natimerry/repak-rivals
• add devShell to make development environment ready (you can enter devShell by running nix develop)
• able to compile a program directly via nix build
• end user will be able to install this package by importing the inputs and add inputs.repak-rivals.packages.${system}.default (assuming they add the input name as repak-rivals)

idk what to say anymore man, tbh i dont think i even need crane but its so easy and pretty well documented compared to nixpkgs so i just use it

[Copilot]

Pull request overview

Adds Nix flake support so the project can be built, run, and developed via standard nix commands (including nix run, nix build, and nix develop) using Crane + Fenix toolchains.

Changes:

• Introduces flake.nix using flakelight + crane to build the Rust project and expose an app entrypoint for repak-gui.
• Adds a Rust dev shell with the Fenix toolchain (including rust-analyzer).
• Adds flake.lock pinning nixpkgs/crane/fenix/flakelight inputs for reproducible builds.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 4 comments.

File	Description
flake.nix	Defines packages/apps/devShell via flakelight; builds with Crane and wraps repak-gui for runtime libs.
flake.lock	Locks dependency revisions/hashes for reproducibility.

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