I'm not great at Docker and trying to learn a little more.
What does the RUN yes | blah blah blah mean? I found it on the web when trying to fix docker and xdebug, which I'm still not finished doing but to fix it I have to start understanding more of the underlying components of how Docker is supposed to work.
This page (frustratingly) has NO information about it: https://docs.docker.com/engine/reference/run/
