Workaround for encryption/decryption failure when ssh into a mac

[rayluo]

It is observed (from elsewhere) that encryption/decryption attempt would fail when ssh into a mac.

Persistence check failed. Inspect inner exception for details
---> System.Exception: SecKeychainAddGenericPassword failed with error code: -25308

The solution here is to ask the end user to unlock their Mac first via the command:

security unlock-keychain -p $PASSWORD /Users/$USERNAME/Library/Keychains/login.keychain-db

Would need to ideally repro the issue, and then catch the exception and emit that workaround in the message.