Add isolated users to headless console (#533)

app/Http/Controllers/ConsoleController.php

@@ -21,7 +21,7 @@ public function run(Server $server, Request $request)
         $this->validate($request, [
             'user' => [
                 'required',
-                Rule::in(['root', $server->ssh_user]),
+                Rule::in($server->getSshUsers()),
             ],
             'command' => 'required|string',
         ]);