Trying to run "sudo apt-get update" in docker container ,but do not have password for redash

I want to install some app in docker container(redash/redash:8.0.0.b32245) ,so run"sudo apt-get update", ,but do not have password for redash(or root)?
thanks!

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

#1) Respect the privacy of others.
#2) Think before you type.
#3) With great power comes great responsibility.

[sudo] password for redash:

I don’t think our Docker configuration specifies a password for the Redash user. The “Docker” way to do what you describe is add whatever commands you would like to run to the Dockerfile itself and then rebuild the container.

Thanks for the quick reply. your reply is very helpful