Pre-submission checks

• I am not reporting a bug (crash, false positive/negative, etc). These must be filed via the bug report template.
• I have looked through both the open and closed issues for a duplicate request.

What's the problem this feature will solve?

Sometimes I can’t be sure whether the zizmor.yml I wrote is valid.

Describe the solution you'd like

Publish the schema of zizmor.yml to https://www.schemastore.org so that other tools can check whether zizmor.yml contains any errors.

That way, the pre-commit hook provided by https://github.com/python-jsonschema/check-jsonschema can check the validity of zizmor.yml.

Additional context

No response