code: def _cloud_sql_proxy_entry(
      user_id: int,
      user_group: int,
      caliban_config: Optional[Dict[str, Any]] = None,
  ) -> str:
      """returns dockerfile entry to fetch cloud_sql_proxy, installing in /usr/bin.
  
      Args:
      user_id: id of non-root user
      user_group: id of non-root group for user
      caliban_config: dictionary of caliban configuration options
  
      Returns:
      string with Dockerfile directives to install cloud_sql_proxy as root
      and reset the user to the specified user_id:user_group.
  
      """
      caliban_config = caliban_config or {}
      mlflow_cfg = caliban_config.get("mlflow_config")
  
      if mlflow_cfg is None:
          return ""
  
      return f"""
  USER root
  
  RUN wget \
    -q https://dl.google.com/cloudsql/cloud_sql_proxy.linux.amd64 \
    -O /usr/bin/cloud_sql_proxy \
    && chmod 755 /usr/bin/cloud_sql_proxy
  
  USER {user_id}:{user_group}
  """
  
imports: from __future__ import absolute_import, division, print_function
  import json
  import os
  import subprocess
  import tempfile
  from enum import Enum
  from pathlib import Path
  from typing import Any, Dict, List, NamedTuple, NewType, Optional, Union
  from absl import logging
  from blessings import Terminal
  import caliban.config
  import caliban.util
  import caliban.util.fs
  import caliban.util.metrics
label_desc: Use image node_id 13 for calling a global function with example usage: _cloud_sql_proxy_entry(user_id, user_group, caliban_config) and returns: str, user_id, str, user_group, str, str