Permission denied (publickey).
The command '/bin/sh -c mkdir ~/.ssh &&     echo "$SSH_PRIVATE_KEY" >> ~/.ssh/id_rsa &&     chmod 0600 ~/.ssh/id_rsa &&     echo "Host gitlab.com"$'\n\t'"IdentityFile ~/.ssh/id_rsa" >> ~/.ssh/config &&     ssh-keyscan -t rsa gitlab.com >> ~/.ssh/known_hosts &&     cat /root/.ssh/id_rsa &&     ssh -Tv git@gitlab.com' returned a non-zero code: 255
section_end:1551803673:build_script
section_start:1551803673:after_script
+ set -eo pipefail
+ set +o noclobber
+ eval ''
+ :
+ exit 0
++ '[' 2 = 1 ']'
section_end:1551803673:after_script
ERROR: Job failed: exit status 1