def _add_mount(self,<EOL>name,<EOL>mount_path,<EOL>sub_path,<EOL>read_only):
self.volume_mounts.append({<EOL>'<STR_LIT:name>': name,<EOL>'<STR_LIT>': mount_path,<EOL>'<STR_LIT>': sub_path,<EOL>'<STR_LIT>': read_only<EOL>})<EOL>
Args:
    name (str):
    mount_path (str):
    sub_path (str):
    read_only:

Returns: