feat: speed-up nix shells with nix-direnv

configuration.nix

@@ -96,9 +96,22 @@
     forwardX11 = true;
   };
 
+  services.printing = {
+    enable = true;
+  };
+
+  services.avahi = {
+    enable = true;
+    nssmdns = true;
+  };
+
   nix = {
     package = pkgs.nixFlakes;
-    extraOptions = "experimental-features = nix-command flakes";
+    extraOptions = ''
+      experimental-features = nix-command flakes
+      keep-outputs = true
+      keep-derivations = true
+    '';
 
     autoOptimiseStore = true;
     gc = {

home-manager/direnv.nix

@@ -5,6 +5,7 @@
     direnv = {
       enable = true;
       enableZshIntegration = true;
+      nix-direnv.enable = true;
     };
   };
 }