Dockerfile: install WaiverDB app from source
    
    This PR changes the Dockerfile at the root of the source tree to install
    the app from source instead of RPMs. Dependencies still come from the
    Fedora repos.
    
    I also changes the existing Jenkinsfile to use the new docker build parameters.
    The corresponding OpenShift BuildConfig Template is also changed to use
    the Dockerfile at the source root while
    `openshift/containers/waiverdb/Dockerfile` is deleted.
    
    This shouldn't break anything in principle. If anything is missing,
    please add in the comment.