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!)