Update .gitlab-ci.yml

4 jobs for master in 6 minutes and 46 seconds (queued for 2 seconds)
Name Stage Failure
failed
build:ubuntu Test
Running with gitlab-runner 11.10.1 (1f513601)
on runner-01 28asYipT
Using Docker executor with image ubuntu:blaar ...
Pulling docker image ubuntu:blaar ...
ERROR: Job failed: Error response from daemon: manifest for ubuntu:blaar not found (executor_docker.go:168:1s)