[darwin] Add nix-darwin for work laptop

Adds nix-darwin
Simplifies emacs tree-sitter
Probably breaks vterm on linux :(

roles/darwin.nix

@@ -0,0 +1,46 @@
+{ lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    time.timeZone = "America/Los_Angeles";
+
+    environment.systemPackages = with pkgs; [
+      git
+      glances
+      pciutils
+      tree
+      usbutils
+      vim
+    ];
+
+    nix = {
+      package = pkgs.nix;
+      # distributedBuilds = true;
+      # buildMachines = [{
+      #   hostName = "z790prors.oglehome";
+      #   system = "x86_64-linux";
+      #   protocol = "ssh-ng";
+      #   sshUser = "johno";
+      #   sshKey = "/root/.ssh/id_ed25519";
+      #   maxJobs = 3;
+      #   speedFactor = 2;
+      # }];
+      settings = {
+        experimental-features = [ "nix-command" "flakes" ];
+        max-jobs = "auto";
+        trusted-users = [ "johno" ];
+        substituters = [
+        ];
+      };
+
+      gc = {
+        automatic = true;
+        options = "--delete-older-than 10d";
+      };
+    };
+
+    nixpkgs.config.allowUnfree = true;
+  };
+}