code: def __init__(self, service_account: ServiceAccount):
      self.service_account = service_account
      self.s = requests.Session()
      self.expires_at = 0
  
imports: import time
  from typing import Dict, List, Optional
  import jwt
  import requests
  from dstack._internal.core.backends.nebius.types import ClientError, ConflictError, ForbiddenError, NebiusError, NotFoundError, ResourcesSpec, ServiceAccount
  from dstack._internal.utils.logging import get_logger
label_desc: Use image node_id 1 to create a new NebiusAPIClient object  with example: obj = NebiusAPIClient(service_account)