Update .gitlab-ci.yml

1 job for master in 26 seconds (queued for 1 second)
Name Stage Failure
failed
Test SSH Test
# bwunicluster.scc.kit.edu:22 SSH-2.0-OpenSSH_8.3
# bwunicluster.scc.kit.edu:22 SSH-2.0-OpenSSH_8.3
$ chmod 644 ~/.ssh/known_hosts
$ ssh -o 'StrictHostKeyChecking no' $USER_NAME "mkdir -p testscript && scp testscript.sh $USER_NAME:~/testscript/testscript.sh && cd testscript && ls -al"
Warning: Permanently added the ECDSA host key for IP address '129.13.56.18' to the list of known hosts.
Host key verification failed.
lost connection
Cleaning up file based variables
ERROR: Job failed: exit code 1