fix: determinate nix + nix darwin

modules/darwin/nix/default.nix

@@ -8,6 +8,7 @@ in
 {
   options.${namespace}.nix = {
     enable = mkBoolOpt true "Whether or not to manage nix configuration.";
+    usingDeterminate = mkBoolOpt false "Whether we're using determinate nix";
     package = mkOpt types.package pkgs.nixVersions.latest "Which nix package to use.";
   };
 
@@ -48,11 +49,11 @@ in
 
         checkConfig = true;
         distributedBuilds = true;
-        optimise.automatic = true;
+        optimise.automatic = !cfg.usingDeterminate;
         registry = lib.mkForce mappedRegistry;
 
         gc = {
-          automatic = true;
+          automatic = !cfg.usingDeterminate;
           options = "--delete-older-than 7d";
         };
 

systems/aarch64-darwin/mac-va-mbp-personal/default.nix

@@ -1,13 +1,14 @@
-{ namespace, lib, ... }:
-let
-  inherit (lib.${namespace}) enabled;
-in
+{ lib, ... }:
 {
   system.stateVersion = 6;
+  nix.enable = false;
 
   # System Config
   reichard = {
-    nix = enabled;
+    nix = {
+      enable = true;
+      usingDeterminate = true;
+    };
 
     security = {
       sops = {