updates

flake.nix

@@ -1,7 +1,13 @@
 {
   description = "NixOS Configuration";
 
+  nixConfig = {
+    extra-substituters = [ "https://devenv.cachix.org" ];
+    extra-trusted-public-keys = [ "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=" ];
+  };
+
   inputs = {
+    devenv.url = "github:cachix/devenv";
     disko = {
       url = "github:nix-community/disko";
       inputs.nixpkgs.follows = "nixpkgs";