Update .gitlab-ci.yml

1 job for master in 21 seconds
Status Name Job ID Coverage
  Deploy
failed deploy #770

00:00:21

 
Name Stage Failure
failed
deploy Deploy
(6/6) Installing rsync (3.1.2-r6)
Executing busybox-1.26.2-r9.trigger
OK: 238 MiB in 107 packages
$ mkdir -p ~/.ssh
$ eval $(ssh-agent -s)
Agent pid 16
$ ssh-add <(echo "$STAGING_PRIVATE_KEY")
Error loading key "/dev/fd/63": invalid format
ERROR: Job failed: exit code 1