[Issue:4753] Add encryption docs to Functions develop

[wolfstudy]

Signed-off-by: xiaolong.ran rxl@apache.org

Fixes #4753

Motivation

The encryption section in the Functions develop chapter is missing.

Modifications

• Add encryption docs to Functions develop

[wolfstudy]

@sijie @jennifer88huang PTAL, thanks.

[Jennifer88huang-zz]

If the security mechanism for Pulsar Functions is the same with that in Pulsar Functions worker, it's ok to add link here.

[Jennifer88huang-zz]

run integration tests
run java8 tests

[wolfstudy]

run java8 tests

[sijie]

I don't think that's what the original github issue asks for. The original issue asks for the documentation around security especially secrets (https://github.com/apache/pulsar/tree/master/pulsar-functions/secrets) in the development of functions. It is not about security in the function worker.

[wolfstudy]

I don't think that's what the original github issue asks for. The original issue asks for the documentation around security especially secrets (https://github.com/apache/pulsar/tree/master/pulsar-functions/secrets) in the development of functions. It is not about security in the function worker.

Thanks @sijie clarification, will fix it.

[wolfstudy]

@sijie @jennifer88huang PTAL again, thanks.

[wolfstudy]

run java8 tests

[wolfstudy]

org.apache.bookkeeper.mledger.impl.ManagedLedgerFactoryChangeLedgerPathTest.setUp

run java8 tests