How to run docker command in Docker plugin

Hi everyone, I’m trying to run a docker command for my docker cloud node, but as it mentioned in the documentation it may conflicts with the SSH launcher.
I’m looking for a way to do it properly, any idea would be great!
this is my command:
cat /etc/hosts_extra >> /etc/hosts

and I’m trying this one regarding the document solution cat /etc/hosts_extra >> /etc/hosts $@