add SSH key as in GitLab instructions

2 jobs for 10-automatically-deploy-documentation-to-cryptops-com in 43 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build
passed build #10591

00:00:32

 
  Deploy
failed deploy-master #10592

00:00:11

 
Name Stage Failure
failed
deploy-master Deploy There is an unknown failure, please try again
(7/7) Installing rsync (3.1.1-r2)
Executing busybox-1.24.2-r0.trigger
OK: 65 MiB in 27 packages
$ ./deploy.sh
Agent pid 19
Enter passphrase for (stdin): ssh: connect to host ftp.greenhost.nl port 22: Connection refused
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.1]
ERROR: Job failed: exit code 255