Ticket 50831 add cargo.lock to allow offline builds
    
    Bug Description: We need cargo.lock to be distributed to allow offline
    builds of the application
    
    Fix Description: In offline builds without cargo.lock present, the build
    fails as the versions are checked.
    
    https://pagure.io/389-ds-base/issue/50831
    
    Author: William Brown <william@blackhats.net.au>
    
    Review by: mhonek