Provide GitLab CI YAML linting tool as standalone native app

I've been searching for it today, but haven't found a native app variant of the GitLab CI YAML (in brief, the YAML) file linter as available over the web. This is a pressing requirement, since it allows one to use the tool from e.g. repos' pre-commit configs (e.g., via Yelp pre-commit) and thereby actively prevent commits that result in invalid YAML.