Ticket 49207 - Supply docker POC build for DS.
Fix Description: Supply a proof of concept docker build file for
389 Directory Server. This container will contain a single instance
of directory server with no backends. It should be administered
with dsconf / ldif.
https://pagure.io/389-ds-base/issue/49207
Author: wibrown
Review by: nhosoi, lslebodn (thanks!)