sshd's been installed for remote IDE development environment with sftp.
So that you connect to container with ssh, you have to login with root which has a default password 'admin' firstly. I recommend to change your container's root password as soon as booting your container.
You have to run with "/usr/sbin/sshd -D" command with deamon process. normally, If you try to attach to container, you wouldn't be taken shell prompt.
*Trying "exec -it container /bin/bash" for entering into your process on.