Refactorings of the Traefik Configuration for the Developer docker-compose Setup

The Traefik configuration for the docker-compose developer setup has been refactored.

Follow Section, “Refactorings of the Traefik Configuration for the Developer docker-compose Setup” for upgrade information.

(CMS-21441)

Fixed Directory Ownership in Container Images

The ownership of the /coremedia directory was root but should be coremedia.

(CMS-21079)