fix: remove 'PermitRootLogin yes' from sshd_config for improved security

Signed-off-by: Yun Pan <[email protected]>

Author: dinoallo

OS/ubuntu-cuda/24.04/Dockerfile

@@ -32,7 +32,6 @@ RUN chmod +x /usr/start/startup.sh && \
     echo 'GatewayPorts yes' >> /etc/ssh/sshd_config && \
     echo 'X11Forwarding yes' >> /etc/ssh/sshd_config && \ 
     echo 'Port 22' >> /etc/ssh/sshd_config && \
-    echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config && \
     echo 'AuthorizedKeysFile  /usr/start/.ssh/authorized_keys' >> /etc/ssh/sshd_config && \
     echo 'PasswordAuthentication no' >> /etc/ssh/sshd_config && \
     echo 'PermitRootLogin prohibit-password' >> /etc/ssh/sshd_config && \