need help about sealing usage on gramine-sgx

[超人]

Dear gramine maintainer:

I am learning gamine-six on the tutorial https://gramine.readthedocs.io/en/latest/manifest-syntax.html and demo https://github.com/gramineproject/gramine/tree/master/CI-Examples. I want to use the sealing function , but I can not find demo or torurial about sealing usage on the links above,  Could you please supply a demo about sealing on gamine-six? 

thank you very much!

from riclee