install go and gopls in nix flake devShell

flake.nix

@@ -3,14 +3,15 @@
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
   };
-  outputs =
-    { nixpkgs, flake-utils, ... }:
+  outputs = {
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
     flake-utils.lib.eachDefaultSystem (
-      system:
-      let
+      system: let
         pkgs = nixpkgs.legacyPackages.${system};
-      in
-      {
+      in {
         devShells.default = pkgs.mkShell {
           buildInputs = with pkgs; [
             # generic
@@ -31,6 +32,8 @@
             # backend
             gofumpt
             sqlite
+            go
+            gopls
           ];
         };
       }