Ticket 50484 - Add a release build dockerfile and dscontainer improvements
    
    Bug Description: In testing a production deployment of 389-ds-base
    from the source tree, a new dockerfile was added to handle the release
    build and proper image cleanups. Additionally, some issues with sigchld
    handling were noted.
    
    Fix Description:
    * Add a .release dockerfile for the suse base image which cleans up
      after itself correctly.
    * Catch extra arguments to the sigchld handler
    * Create directories in /data with more open permissions to account for
      id changes.
    
    https://pagure.io/389-ds-base/pull-request/50484
    
    Author: William Brown <william@blackhats.net.au>
    
    Review by: mhonek (Thank you!)