Update .gitlab-ci.yml

1 job for master in 23 seconds (queued for 2 seconds)
Name Stage Failure
failed
Test SSH Test
# bwunicluster.scc.kit.edu:22 SSH-2.0-OpenSSH_8.3
$ chmod 644 ~/.ssh/known_hosts
$ scp testscript.sh $USER_NAME:~/testscript/testscript.sh
Warning: Permanently added the ECDSA host key for IP address '129.13.56.20' to the list of known hosts.
$ ssh $USER_NAME "testscript/testscript.sh"
Warning: Permanently added the ECDSA host key for IP address '129.13.56.18' to the list of known hosts.
bash: testscript/testscript.sh: Permission denied
Cleaning up file based variables
ERROR: Job failed: exit code 1