monorepo lab stuff, init zen

nixos/modules/pkgs.nix

@@ -0,0 +1,17 @@
+{ pkgs, config, lib, ...}:
+let cfg = config.system-pkgs; in {
+  options.system-pkgs = {
+    enable = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      git
+      vim
+      tmux
+    ];
+  };
+}