ref(nix): tungsten use nix-darwin

nix/hosts/tungsten/default.nix

@@ -0,0 +1,27 @@
+{ pkgs, hostname, ... }@input:
+{
+  nixpkgs.hostPlatform = "x86_64-darwin";
+  system.stateVersion = 4;
+  services.nix-daemon.enable = true;
+
+  networking.hostName = hostname;
+  environment.shells = [ pkgs.fish ];
+
+  nix.settings.trusted-users = [ "leana" ];
+
+  nix.gc = {
+    automatic = true;
+    interval = {
+      Weekday = 0;
+    };
+    options = "--delete-older-than 30d";
+  };
+
+  environment.systemPackages = with pkgs; [
+    vim
+    gnumake
+    gnused
+    gcc
+    cachix
+  ];
+}