3d8f591 openshift-apps: use dumb-init for the sleep for ostree pruner/importer

Authored and Committed by dustymabe a year ago
    openshift-apps: use dumb-init for the sleep for ostree pruner/importer
    
    The uptream of these two was changed to use `dumb-init` to allow for
    defunt processes to get reaped in the container [1] so let's change the
    commented out sleep commands to do the same.
    
    [1] https://github.com/coreos/fedora-coreos-releng-automation/commit/9d5618eace82ff11afa3688dfe5a1f7c670059b7