fix(gitlab_validate_ci_yaml): syntax error

[TenviLi]

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[HariSekhon]

Did this cause you an issue and if so could you please post the output showing it, as this seems to work for me and the trailing $ is there to ensure it's the filename, not just a part of a path, eg.

$ gitlab_validate_ci_yaml.sh ./.gitlab-ci.yml/blah
invalid filename given, must be called '.gitlab-ci.yml', instead got:  ./.gitlab-ci.yml/blah

$ gitlab_validate_ci_yaml.sh ./.gitlab-ci.yml
valid