configure nix in home-manager

home/yt/common.nix

@@ -5,6 +5,27 @@
     ../zsh
   ];
 
+  nix = {
+    settings = {
+      experimental-features = "nix-command flakes";
+      auto-optimise-store = true;
+      flake-registry = "";
+      trusted-users = [ "root" "@wheel" ];
+      trusted-public-keys = [ "central:uWhjva6m6dhC2hqNisjn2hXGvdGBs19vPkA1dPEuwFg=" ];
+      substituters = [ "https://cache.cything.io/central" ];
+    };
+    gc = {
+      automatic = true;
+      frequency = "19:00";
+      persistent = true;
+      options = "--delete-older-than 14d";
+    };
+    extraOptions = ''
+	    builders-use-substitutes = true
+	  '';
+    package = pkgs.nix;
+  };
+
   home.sessionVariables = {
     "EDITOR" = "nvim";
   };

hosts/common.nix

@@ -23,7 +23,6 @@
     extraOptions = ''
 	    builders-use-substitutes = true
 	  '';
-
   };
   time.timeZone = "America/Toronto";
   networking.firewall.logRefusedConnections = false;