class_docstr: Exposes secrets from environment variables.
code: def get_sync(self, key, **kwargs) -> Optional[ISecret]:
      if key in os.environ:
          return UnencryptedSecret(key, os.getenv(key))
      return None
  
file_path: fiftyone/fiftyone/internal/secrets/providers/local.py
imports: import re
  from ..providers.iprovider import ISecretProvider
  from ..secret import UnencryptedSecret, ISecret
  import os
  from typing import Dict, List, Optional
label_desc: Use image node_id 1 for calling the EnvSecretProvider obj's underlying member method code with example usage: obj.get_sync(key) and returns: None, UnencryptedSecret