feat: add nix output

flake.nix

@@ -1,7 +1,13 @@
 {
-  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
 
-  outputs = { self, nixpkgs, ... }:
+  outputs = { self, fenix, nixpkgs, ... }:
     let
       allSystems = [
         "x86_64-linux" # 64-bit Intel/AMD Linux
@@ -12,10 +18,26 @@
       forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
         inherit system;
         pkgs = import nixpkgs { inherit system; };
+        fpkgs = import fenix { inherit system; };
       });
     in
     {
-      devShell = forAllSystems ({ system, pkgs }:
+      packages = forAllSystems
+        ({ system, pkgs, fpkgs }:
+          let
+            toolchain = fpkgs.minimal.toolchain;
+          in
+          rec {
+            default = flurry;
+            flurry =
+              (pkgs.makeRustPlatform { cargo = toolchain; rustc = toolchain; }).buildRustPackage {
+                pname = "flurry";
+                version = "0.1.0";
+                cargoLock.lockFile = ./Cargo.lock;
+                src = pkgs.lib.cleanSource ./.;
+              };
+          });
+      devShell = forAllSystems ({ system, pkgs, ... }:
         pkgs.mkShell {
           buildInputs = [
             pkgs.rustup
@@ -26,3 +48,4 @@
         });
     };
 }
+