add gc

nixos/configuration.nix

@@ -7,17 +7,20 @@
 {
   imports = [ ];
 
-  nix.settings.experimental-features = [
+  nix = {
-    "nix-command"
+    settings.experimental-features = [
-    "flakes"
+      "nix-command"
+      "flakes"
+    ];
 
-  ];
+    gc = {
-  nix.gc = {
+      automatic = true;
-    automatic = true;
+      persistent = true;
-    persistent = true;
+      dates = [ "daily" ];
-    dates = [ "daily" ];
+      options = "--delete-older-than 7d";
-    options = "--delete-older-than 7d";
+    };
   };
+
   nixpkgs.config.allowUnfree = true;
 
   # Secret Management