formatter + nixConfig

flake.nix

@@ -1,4 +1,9 @@
 {
+  nixConfig = {
+    trusted-substituters = "https://cache.nixos.org/";
+    trusted-public-keys = "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=";
+    extra-experimental-features = "nix-command flakes";
+  };
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.11-small";
     flake-compat = {
@@ -7,13 +12,15 @@
     };
     flake-utils.url = "github:numtide/flake-utils";
   };
-  outputs = { nixpkgs, flake-utils, ... }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let
+  outputs = {
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
       pkgs = import nixpkgs {inherit system;};
       devDeps = with pkgs; [bash hugo zopfli brotli parallel];
-      in
-      {
+    in {
       devShells.default = pkgs.mkShell {
         name = "rules_nixpkgs_shell";
         packages = devDeps;
@@ -23,5 +30,8 @@
       #packages = flake-utils.lib.mkApp {
       #  name = "build
       #};
+
+      formatter = pkgs.alejandra;
+
     });
 }