Enable test deploy in CI
    
    This evaluates deploy.py for every merge to production. Once we
    become satisfied with the evaluation, we can update "--mode test"
    to "--mode fire".
    The existing "deploy" job is renamed to "sync", as it only copies
    data.
    
    Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>