First time using Docker + Plone 6: where's the buildout file to change settings?

This is my first time using Docker to install Plone 6 on a cloud service. Is this the best way to install it? I followed these directions: Containers – Install — Plone Documentation v6.0

Except I switched out my IP address instead of "localhost" (I figured since it's an server and not my local computer that I'd do this).

Initially it pulls up fine and appears to be working. However, I was wondering, since it's on a virtual machine, how would I go about changing this install... say if I want to tweak the buildout file and re-start it with those new settings? I know it's kind of like a container/virtual machine thing, so I'm not sure if this is possible?

Thanks, and sorry for such a newbie question.