code: def modify_context(
      self,
      uris: List[str],
      runtime_env: RuntimeEnv,
      ctx: RuntimeEnvContext,
      logger: logging.Logger,
  ) -> None:
      plugin_config_dict = runtime_env[MY_PLUGIN_NAME]
      ctx.env_vars[MyPlugin.env_key] = str(
          plugin_config_dict["env_value"]
      )
      ctx.command_prefix += [
          "echo",
          plugin_config_dict["tmp_content"],
          ">",
          plugin_config_dict["tmp_file"],
          "&&",
      ]
      ctx.py_executable = (
          plugin_config_dict["prefix_command"] + " " + ctx.py_executable
      )
  
imports: import asyncio
  import logging
  import os
  from pathlib import Path
  import time
  from unittest import mock
  import tempfile
  import json
  from typing import List
  import pytest
  import ray
  from ray._private.runtime_env.context import RuntimeEnvContext
  from ray._private.runtime_env.plugin import RuntimeEnvPlugin
  from ray._private.test_utils import enable_external_redis, wait_for_condition
  from ray.exceptions import RuntimeEnvSetupError
  from ray.runtime_env.runtime_env import RuntimeEnv
label_desc: Use image node_id 2 for calling the MyPlugin obj's underlying member method code with example usage: obj.modify_context(uris, runtime_env, ctx, logger) without return types