add any-nix-shell

nixos/shell.nix

@@ -6,6 +6,10 @@
 
   programs.command-not-found.enable = false;
 
+  environment.systemPackages = with pkgs; [
+    any-nix-shell
+  ];
+
   users.defaultUserShell = pkgs.xonsh;
   programs.xonsh =
     let
@@ -30,6 +34,7 @@
         gh copilot alias -- bash > @(tmpfile)
         source-bash @(tmpfile)
         ulimit -n 4096 # This is so that Gauntlet is able to be built
+        execx($(${pkgs.any-nix-shell}/bin/any-nix-shell xonsh --info-right))
       '';
       package = pkgs.xonsh.override {
         extraPackages = ps: [