While DockerFile is proposed to be in the main codebase (to allow easier building), the various Docker Compose files are still maintained in the separate repo at https://github.com/DSpace-Labs/DSpace-Docker-Images
All note that this PR should just be merged. It's ready and Terry & Pablo have been testing/working with it.
https://github.com/DSpace/DSpace/pull/2125 - Some disagreement around appropriate endpoint. We may need to move this forward quickly as-is, and create a ticket to correct later.