Add JSON schema to schemastore.org for integration into VSCode

[lox]

Describe the feature:

Since there is now a JSON schema (#793) would be great to have it mapped to goss.yml files via Schema Store. This would mean that folks using editor plugins like https://github.com/redhat-developer/vscode-yaml would immediately get validation for their goss files.

Describe the solution you'd like
Reference the JSON Schema via https://github.com/SchemaStore/schemastore/blob/master/CONTRIBUTING.md#catalog (happy to do this if there is interest)

Describe alternatives you've considered
Manual editor configuration.

[aelsabbahy]

@gberche-orange and @ripienaar any thoughts on this?

@lox for my own clarity, it seems the actual PR would be to the schemastore repo, not Goss, correct? Or is there something needed to be also done here.

[ripienaar]

This would be a great addition.

[aelsabbahy]

Heads up, v0.4.0 release candidate just went out. It may impact some of the schemas that were written up.

Please let me know if you have any questions.

[gberche-orange]

thanks @aelsabbahy ! I'll try updating the json schema against https://github.com/goss-org/goss/releases/tag/v0.4.0-rc.1 and propose a unit tests for future regressions in goss-org/goss, either this week or more likely early September when I some available time. Anyone feel free to tackle this earlier if some bandwidth is available earlier. After that, we can get a PR on schemastore, possibly versioned if there is need to account for breaking changes in syntax in 0.4