docs: def make_copy_paste_env(env: Dict[str, str]) -> str:
      """
      Convert an environment into a set of commands that can be copied/pasted, on
      the build platform, to recreate that environment.
      """
      windows = platform.system() == "Windows"
      cmd = "set" if windows else "export"
      return (
          "\n".join(
              "{cmd} {k}={v}".format(
                  cmd=cmd,
                  k=k,
                  v=env[k] if windows else subprocess.list2cmdline([env[k]])
              ) for k in sorted(env.keys())
          )
      )