feat: shoukei - add x64 support via binfmt

outputs/default.nix

@@ -26,6 +26,13 @@
         # To use chrome, we need to allow the installation of non-free software
         config.allowUnfree = true;
       };
+
+      pkgs-x64 = import nixpkgs {
+        system = "x86_64-linux";
+
+        # To use chrome, we need to allow the installation of non-free software
+        config.allowUnfree = true;
+      };
     };
 
   # This is the args for all the haumea modules in this folder.