Update .gitlab-ci.yml

2 jobs for JAFromDAQWorkshop in 3 seconds
Name Stage Failure
build_Ph2_ACF Test
Running with gitlab-runner 12.6.0 (ac8e767a)
on default-runner-7685f6989c-p7n74 xST_7xmp
Using Docker executor with image docker:cc7-base ...
WARNING: Container based cache volumes creation is disabled. Will not create volume for "/cache"
Pulling docker image docker:cc7-base ...
ERROR: Job failed: Error response from daemon: manifest for docker:cc7-base not found (executor_docker.go:188:1s)