share user configuration between systems

nix/system/common/users.nix

@@ -0,0 +1,15 @@
+{ config, pkgs, ... }:
+
+{
+  users.users.haak = {
+    isNormalUser = true;
+    extraGroups = [
+      "wheel" # Enable ‘sudo’ for the user.
+      "networkmanager" # Allow the user to manage networks
+    ];
+  };
+
+  users.extraUsers.haak = {
+    shell = pkgs.zsh;
+  };
+}