[Feature Request] support password-based authentication for repo using rsync

[truc0]

Currently, the repository supports rsync synchronization with SSH key-based authentication 1 and environment variable-based password authentication 2. However, there are some upstream mirrors that provide authentication using the rsync://username:password@remote format.

Feature Request

Add support for password-based authentication in the URL format: rsync://username:password@remote. rsync_password.sh can be a good reference.

Implementation Considerations

1. The password should be handled securely
2. Maintain backward compatibility with existing authentication methods

Would appreciate feedback on this feature request and its potential implementation approach.

cc @bukita1999