Add maru-runner JSON schema

[joonas]

This PR adds a new JSON Schema for maru-runner, Defense Unicorn's open source task runner tool.

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @madskristensen and @hyperupcall - if they write a comment saying "LGTM" then it will be merged.

[hyperupcall]

Thanks - is it possible to have a more generic fileMatch the current one is likely to have many false positives (more details about that in CONTRIBUTING.md)

[joonas]

Thanks - is it possible to have a more generic fileMatch the current one is likely to have many false positives (more details about that in CONTRIBUTING.md)

Hey @hyperupcall, in practice we often see Maru Runner files under a tasks/ directory (see for example tasks/*.yaml across defenseunicorns organization), but I noticed that this would conflict with Ansible Tasks files - it seemed from the validation in the repository that overlapping patterns are discouraged in general, so I settled for a more generic pattern that still happens in practice.

Do you have a recommendation for the best way to move forward so as to not create an overly generic matcher here?

[madskristensen]

Use www subdomain instead of json

[joonas]

done, thank you!