def METHOD_NAME(self) -> None:
    """
    Post initialization method
    Creates custom directory to prepare the boot image
    root filesystem which is a separate image to create
    the initrd from
    """
    # builtin kiwi initrd builds its own root tree to create
    # an initrd from. Thus there is no pre defined boot root
    # directory
    self.boot_root_directory = ''
    self.temp_directories: List[str] = []
    self.load_boot_xml_description()