Update .gitlab-ci.yml

1 job for master in 22 seconds (queued for 1 second)
Name Stage Failure
failed
Test SSH Test
Setting up tcl8.6 (8.6.10+dfsg-1) ...
Setting up tcl-expect:amd64 (5.45.4-2build1) ...
Setting up expect (5.45.4-2build1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.2) ...
/usr/bin/bash: line 119: spawn: command not found
$ spawn echo "$SSH_PRIVATE_KEY" | base64 -d | tr -d '\r' | ssh-add - > /dev/null
Error loading key "(stdin)": invalid format
Cleaning up file based variables
ERROR: Job failed: exit code 1