try crane + rust-overlay

flake.nix

@@ -1,21 +1,45 @@
 {
   description = "Doggo flake";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    crane = {
+      url = "github:ipetkov/crane";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "flake-utils";
+      };
+    };
+  };
 
-  outputs = { self, nixpkgs }:
-    let pkgs = nixpkgs.legacyPackages.x86_64-linux;
-    in {
-      # packages.x86_64-linux.hello = pkgs.hello;
-      # packages.x86_64-linux.hello = nixpkgs.legacyPackages.x86_64-linux.hello;
-      # defaultPackage.x86_64-linux = self.packages.x86_64-linux.hello;
+  outputs = { self, nixpkgs, crane, flake-utils, rust-overlay }:
+    flake-utils.lib.eachSystem [ flake-utils.lib.system.x86_64-linux ] (system:
+      let
+        pkgs = import nixpkgs {
+            system = system;
+            overlays = [ (import rust-overlay) ];
+        };
+    
+        rustToolchain = pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        craneLib = crane.lib.${system}.overrideToolchain rustToolchain;
+      in {
+        packages.default = craneLib.buildPackage {
+          src = craneLib.cleanCargoSource ./.;
 
-      devShell.x86_64-linux = with pkgs;
-        mkShell {
-          buildInputs = [
+          # Add extra inputs here or any other derivation settings
+          buildInputs = with pkgs; [
+            libxkbcommon
+          ];
+
+          nativeBuildInputs = with pkgs; [
             just
-            cargo
-            rustup
             rust-analyzer
           ];
         };
-  };
+      }
+    );
 }