refactor2

system/core/nix.nix

@@ -0,0 +1,19 @@
+{ lib, ...}: {
+  nix = {
+    gc = {
+      automatic = true;
+      dates = "05:30";
+      options = "--delete-older-than 7d";
+    };
+    settings = {
+      keep-outputs = true;
+      auto-optimise-store = true;
+      experimental-features = ["nix-command" "flakes"];
+      trusted-users = ["root" "@wheel"];
+    };
+  };
+
+  # nixpkgs.config.allowUnfreePredicate = (pkg: builtins.elem (lib.getName pkg) [
+  #   "steam"
+  # ]);
+}