feat: add nix build infrastructure

flake.nix

@@ -0,0 +1,20 @@
+{
+  description = "Raytracing renderer written in Rust";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    systems.url = "github:nix-systems/default";
+
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
+
+    nci.url = "github:yusdacra/nix-cargo-integration";
+    nci.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = inputs@{ flake-parts, systems, nci, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = import systems;
+      imports = [ nci.flakeModule ./module.nix ];
+    };
+}