测试
测试 d2 插件是否可用：
d2
1Database -> S3: backup
2Database -> S3
3Database -> S3: backup
这是第二个图：
d2
1Stage One -> Stage Two -> Stage Three -> Stage Four
2Stage Four -> Stage One: repeat
测试 d2 插件是否可用：
1Database -> S3: backup
2Database -> S3
3Database -> S3: backup
这是第二个图：
1Stage One -> Stage Two -> Stage Three -> Stage Four
2Stage Four -> Stage One: repeat