/usr/bin/ssh-agent
$ eval $(ssh-agent -s)
Agent pid 12
$ ssh-add <(echo "$GITLAB_PRIVATE_KEY")
Identity added: /dev/fd/63 (/dev/fd/63)
$ ssh git@git.carrotlabs.net
Pseudo-terminal will not be allocated because stdin is not a terminal.
Host key verification failed.
section_end:1544252504:build_script
section_start:1544252504:after_script
section_end:1544252507:after_script
section_start:1544252507:upload_artifacts_on_failure
section_end:1544252510:upload_artifacts_on_failure
ERROR: Job failed: exit code 1