update default imports

default.nix

@@ -25,10 +25,6 @@ let
 in
 {
 
-  nix.settings.experimental-features = [
-    "nix-command"
-    "flakes"
-  ];
   networking.nameservers = [
     "9.9.9.9"
     "1.1.1.1"
@@ -36,7 +32,21 @@ in
 
   boot.kernelPackages = pkgs.linuxPackages_latest;
 
-  nix.settings.trusted-users = [ "administration" ];
+  nix = {
+    settings = {
+      experimental-features = [
+        "nix-command"
+        "flakes"
+      ];
+      trusted-users = [ "administration" ];
+      auto-optimise-store = true;
+    };
+    optimise.automatic = true;
+    gc = {
+      automatic = true;
+      options = "--delete-older-than 42d";
+    };
+  };
 
   networking.domain = "htw.stura-dresden.de";
 

flake.nix

@@ -117,13 +117,19 @@
         // {
           "${input}" = nixpkgs.lib.nixosSystem {
             system = "x86_64-linux";
-            modules = [
+            modules =
+              let
+                modulesPath = "${nixpkgs}";
+              in
+              [
                 ./hosts/${input}
-              ./hosts/${input}/hetzner-disk.nix
                 ./default.nix
                 disko.nixosModules.disko
                 authentik.nixosModules.default
                 mailserver.nixosModules.mailserver
+                {
+                  _module.args = { inherit modulesPath; };
+                }
               ];
           };
         }