bump cuda role: install gpg keys for the nvidia repo
bump cuda role: install gpg keys for the nvidia repo

https://github.com/CSC-IT-Center-for-Science/ansible-role-cuda/issues/6

mantti/fgci-tut,CSC-IT-Center-for-Science/fgci-ansible,mantti/fgci-tut,mantti/fgci-tut