make emulation a module

modules/default.nix

@@ -3,6 +3,7 @@
     ./arduino.nix
     ./common-packages.nix
     ./concentration.nix
+    ./emulation.nix
     ./firefox.nix
     ./fonts.nix
     ./graphical-interface.nix

modules/emulation.nix

@@ -0,0 +1,21 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}: {
+  options = {
+    myModules.enableAarch64Emulation = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = "Enable Aarch64 emulation";
+    };
+  };
+
+  config = lib.mkMerge [
+    (lib.mkIf config.myModules.enableAarch64Emulation {
+        boot.binfmt.emulatedSystems = ["aarch64-linux"];
+        nix.settings.extra-platforms = config.boot.binfmt.emulatedSystems;
+    })
+    ];
+}