python -如何将airflow dag配置为每天运行两次

from datetime import timedelta
from airflow import DAG
from airflow.operators.dummy_operator import DummyOperator
from airflow.operators.python_operator import PythonOperator

def my_task():
    # 在这里编写要执行的任务逻辑
    pass

default_args = {
    'owner': 'your_name',
    'start_date': datetime(2022, 1, 1),
    'retries': 1,
    'retry_delay': timedelta(minutes=5),
}

with DAG('my_dag', default_args=default_args, schedule_interval='0 0,12 * * *') as dag:
    start_task = DummyOperator(task_id='start_task')
    python_task = PythonOperator(task_id='python_task', python_callable=my_task)
    end_task = DummyOperator(task_id='end_task')

    start_task >> python_task >> end_task