Update .gitlab-ci.yml

1 job for master in 27 seconds (queued for 3 seconds)
Name Stage Failure
failed
Test SSH Test
This private key will be ignored.
Reinitialized existing Git repository in /pfs/data5/home/hs/hs_hs/hs_61sima1bif/m4labhpc_test/.git/
git@transfer.hft-stuttgart.de: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
Cleaning up file based variables
ERROR: Job failed: exit code 1