(cli) Exit code 0 when stackl apply fails

[stgrace]

Expected Result

Exit code other than 0

Actual Result

Exit code 0:

$ stackl apply -c stack-instance.yml example
{'status_code': 422, 'detail': 'Could not find a target for services {"example"}', 'headers': None}
Job succeeded

Steps To Reproduce

Create a stack instance that fails due to a policy. Check the exit code with echo $?.