base: move some shared configuration to shared

modules/darwin/base/default.nix

@@ -0,0 +1,12 @@
+{ config, ... }:
+
+let
+  username = config.chvp.username;
+in
+{
+  imports = [
+    ./nix
+  ];
+
+  users.users.${username}.home = "/Users/${username}";
+}

modules/darwin/base/nix/default.nix

@@ -0,0 +1,9 @@
+{ config, ... }:
+
+{
+  nix = {
+    configureBuildUsers = true;
+    gc.interval = if config.chvp.base.nix.slowGc then { Hour = 0; Minute = 0; } else { Minute = 0; };
+  };
+  services.nix-daemon.enable = true;
+}

modules/darwin/default.nix

@@ -1 +1,7 @@
-{ ... }: { }
+{ ... }:
+
+{
+  imports = [
+    ./base
+  ];
+}