added BOOT

modules/system.nix

@@ -8,5 +8,6 @@
     ../system/services.nix
     ../system/tty.nix
     ../system/firewall.nix
+    ../system/boot.nix
   ];
 }

system/boot.nix

@@ -0,0 +1,14 @@
+{...}: {
+  boot.loader = {
+    systemd-boot = {
+      enable = false;
+    };
+    efi = {
+      canTouchEfiVariables = true;
+    };
+    grub = {
+      enable = true;
+      device = "nodev";
+    };
+  };
+}