Add limited internal storage and postgresql

[hzy46]

Docs for the storage:
https://github.com/microsoft/pai/blob/zhiyuhe/loop_storage_and_db/src/internal-storage/README.md

Docs for the postgresql:
https://github.com/microsoft/pai/blob/zhiyuhe/loop_storage_and_db/src/postgresql/README.md

[fanyangCS]

Can you elaborate the fault tolerance design in the document?

[fanyangCS]

do you consider the service dependency? i.e., I assume postgresql can only be deployed after the internal storage has been set up successfully. do you have some script to check the dependency?

[hzy46]

do you consider the service dependency? i.e., I assume postgresql can only be deployed after the internal storage has been set up successfully. do you have some script to check the dependency?

Sure. Please refer to the prerequisite section at https://github.com/microsoft/pai/blob/zhiyuhe/loop_storage_and_db/src/postgresql/deploy/service.yaml#L23 . If internal storage is not ready, the postgresql won't be deployed.