Adding helix extension support

modules/common/default.nix

@@ -1,4 +1,4 @@
-{ nixpkgs-unstable, nixpkgs-stable, pin-factorio, ... }:
+{ nixpkgs-unstable, nixpkgs-stable, pin-factorio, helix-ext, ... }:
 
 {
   imports =
@@ -7,8 +7,8 @@
       ./system.nix
     ];
 
-  # Import local packages
   nixpkgs.overlays = [
+    # Import local packages
     (final: prev: {
       local = import ../../pkgs { pkgs = final; };
     })
@@ -33,6 +33,11 @@
         factorio = import pin-factorio { system = final.stdenv.hostPlatform.system; config.allowUnfree = true; };
       };
     })
+
+    # Helix
+    (final: prev: {
+      helix-with-extensions = helix-ext.packages."x86_64-linux".helix;
+    })
   ];
 
   nixpkgs.config = {