Automate SchemaStore PR creation for new minor/major releases

[arturcic]

Summary

Automate updating the GitVersion JSON schema entry on SchemaStore/schemastore whenever a new GitVersion version with a new schema is released, following the pattern of SchemaStore/schemastore#5485.

Currently this update is done manually after each release that ships a new schema version. It should be automated instead.

What the SchemaStore PR does

For a new version X.Y, it:

1. Adds "X.Y": "https://gitversion.net/schemas/X.Y/GitVersion.configuration.json" to the versions map for the GitVersion entry in src/api/json/catalog.json.
2. Bumps the top-level "url" for that entry to point at the new X.Y schema.
3. Updates the $ref in src/schemas/json/gitversion.json to point at the new X.Y schema URL.

Acceptance criteria

• When a new schema version is published, a PR is automatically opened on SchemaStore/schemastore updating catalog.json and gitversion.json for the new version, without manual intervention.
• Releases that don't introduce a new schema version don't trigger a SchemaStore PR.
• It's possible to trigger the update manually for a specific version, in case the automatic detection is missed or needs to be re-run.

[github-actions]

🎉 This issue has been resolved in version 6.8.1 🎉
The release is available on:

• GitHub Release
• Chocolatey Package
• .Net Global Tool

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