code: def _release_build(branch: Optional[str] = None) -> bool:
      if not branch:
          branch = _BRANCH
      return branch and branch.startswith("releases/")
  
imports: import datetime
  import io
  import json
  import functools
  import glob
  import itertools
  import os
  import platform
  import shutil
  import subprocess
  import sys
  import tarfile
  from collections import defaultdict
  from pathlib import Path
  from typing import List, Optional, Tuple, Dict
  import click
  import docker
label_desc: Use image node_id 3 for calling a global function with example usage: _release_build(branch) and returns: unknown