Cannot use the default admin username and password to login manager.

[jaggerwang]

Describe the bug When tried to login manager, it always shows "The username or password is incorrect".

The env command shows the default admin username and password is just pulsar/pulsar.

I tried to set the admin username and password like here. But the management port only listen on localhost, and I can't install curl command using apt or yum.

Additional context I'm running pulsar 2.7.4 in Kubernetes 1.21.