feat(test): script for simple connect to vm

shell.nix

@@ -1,11 +1,17 @@
 let
   pkgs = import <nixpkgs> { };
+  inherit (pkgs.lib) getExe getExe';
 in
 pkgs.mkShell {
-  buildInputs = with pkgs; [
+  packages = with pkgs; [
     cargo
     rustc
     rustfmt
     nixos-shell
+    (pkgs.writeShellScriptBin "connect_to_vm" ''
+      ${getExe pkgs.sshpass} -p 'vxlan' \
+      ${getExe' pkgs.openssh "ssh"} root@localhost -p 2222 \
+      -o "StrictHostKeyChecking no" -o "UserKnownHostsFile=/dev/null"
+    '')
   ];
 }