code: def __init__(self):
      self.registry: Optional[str] = None
      self.repo: Optional[str] = None
      self.s = requests.Session()
  
file_path: dstack/src/dstack/_internal/server/services/docker.py
imports: from dataclasses import dataclass
  from enum import Enum
  from typing import Optional
  import requests
label_desc: Use image node_id 1 to create a new DockerRegistryClient object  with example: obj = DockerRegistryClient()