Quick lint for gitlab-ci.yml file

gitlab_ci_lint.py

#!/usr/bin/env python3

import gitlab
import sys

g = gitlab.Gitlab(url='https://gitlab.com', ssl_verify=False)
try:
    with open('.gitlab-ci.yml', 'r') as gitlabci:
        content = gitlabci.read()
except FileNotFoundError:
    exit(0)

resp = g.lint(content=content)
if not resp[0]:
    print('GitLab CI: Lint error!')
    print(resp[1])
    exit(1)