Addshore authored Jan 03, 2021 and Addshore committed Jan 07, 2021

This brings some separation between docker related
code and MediaWiki related code making things easier
to follow and enforcing some boundaries.

This was extracted from I7d1a66dd96b293d3fe3d6b371212e34018872a49

Change-Id: I6de4e2218dee3fb8dd596e2f69ddd8f0e37c8a39