Update .gitlab-ci.yml

# This file is a template, and might need editing before it works on your project.

# Official language image. Look for the different tagged releases at:

# https://hub.docker.com/r/library/python/tags/

image: python:latest

image: nvcr.io/nvidia/tensorflow:19.02-py3

# Change pip's cache directory to be inside the project directory since we can

# only cache local items.