Write on-the-fly docker image for Marklogic

The image would probably have to be built from scratch:
https://developer.marklogic.com/blog/building-a-marklogic-docker-container

See also the one available in the catalog here:
https://dockerpriv.nuxeo.com/v2/_catalog

Target versions is 8.0, one image.

More details on Nuxeo specifics here, maybe it is usable:
https://doc.nuxeo.com/810/nxdoc/marklogic/

Target repository:
https://github.com/nuxeo/nuxeo-tools-support-priv/tree/master

Target folder:
docker/images/marklogic

The DB version will then be handled in compose files through a MARKLOGIC_VERSION variable (with a default value matching the Nuxeo version).

Add compose file for simple Nuxeo + DB scenario.