Add default admin user and include in host/installer

hosts/installer.nix

@@ -5,6 +5,7 @@
     (inputs.nixpkgs + "/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix")
     inputs.lix-module.nixosModules.lixFromNixpkgs
     ../modules/system/base.nix
+    ../modules/users/admin.nix
   ];
 
   networking.hostName = "nix-installer";

modules/users/admin.nix

@@ -0,0 +1,11 @@
+{ lib, ... }:
+
+{
+  users.users.admin = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" "networkmanager" ];
+    hashedPassword = "$6$HrwFoHtYRwiTZsYo$gKNOvkQhjalczOLgoTXvVu1MaihYP4BdBnVpWkdoAf.5MAiV2mMPRibYyGv9ti1Q63AhGK7n4wOPjAU0O74mK0";
+  };
+
+  security.sudo.wheelNeedsPassword = lib.mkDefault true;
+}

scripts/install-btrfs.sh

@@ -219,6 +219,7 @@ if [ ! -e "${host_file}" ]; then
   imports = [
     inputs.lix-module.nixosModules.lixFromNixpkgs
     ../modules/system/base.nix
+    ../modules/users/admin.nix
     ./${HOSTNAME}-hardware.nix
   ];