Update .gitlab-ci.yml

1 job for master in 13 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #38026
deploy to staging

00:00:13

 
Name Stage Failure
failed
deploy to staging Test
From https://gitlab.in2p3.fr/cavet/test-ci
96ec6b5..1835a8e master -> origin/master
Checking out 1835a8e2 as master...
Skipping Git submodules setup
$ echo $KUBE_URL
https://35.241.235.99
$ kubectl get nodes
/usr/bin/bash: line 84: kubectl: command not found
ERROR: Job failed: exit code 1