Update .gitlab-ci.yml

1 job for master in 14 seconds (queued for 1 second)
Status Name Job ID Coverage
  Deploy
failed deploy #769

00:00:14

 
Name Stage Failure
failed
deploy Deploy There is an unknown failure, please try again
(3/6) Installing libattr (2.4.47-r6)
(4/6) Installing libacl (2.2.52-r3)
(5/6) Installing popt (1.16-r6)
(6/6) Installing rsync (3.1.2-r6)
Executing busybox-1.26.2-r9.trigger
OK: 238 MiB in 107 packages
$ ssh-add <(echo "$STAGING_PRIVATE_KEY")
Could not open a connection to your authentication agent.
ERROR: Job failed: exit code 1