redirect vllm server actor logs to a file

Signed-off-by: SumanthRH <sumanthrh99@gmail.com>

Author: SumanthRH

skyrl/backends/skyrl_train/inference_servers/vllm_server_actor.py

@@ -123,6 +123,11 @@ def __init__(
                 per-server placement group. Only used when
                 ``distributed_executor_backend="mp"`` and TP*PP > 1.
         """
+        # redirect infrastructure logs to a file before engine init
+        from skyrl.train.utils.ray_logging import redirect_actor_output_to_file
+
+        redirect_actor_output_to_file()
+
         self._cli_args = vllm_cli_args
         self._ip = get_node_ip()
         self._port, self._port_reservation = find_and_reserve_port(start_port)