code: def _read_opref(self):
      encoded = _try_zip_entry(
          self.zip_src, self.prefix, ".guild/opref"
      )
      if encoded:
          return encoded.decode()
      return None
  
file_path: guildai/guild/run_zip_proxy.py
imports: import os
  import zipfile
  import yaml
  from guild import run
label_desc: Use image node_id 2 for calling the RunZipProxy obj's underlying member method code with example usage: obj._read_opref() and returns: None, encoded