Point to ruff external schema

[JonathanPlasse]

Hi,
In compliance with the single source of truth policy, this updates the ruff schema point to the external schema from the official repository.

[EmilyGraceSeville7cf]

Wrong review outcome.

[EmilyGraceSeville7cf]

Mandatory fixes found, changes requested.
Thanks for a contribution! 🚀

[EmilyGraceSeville7cf]

Mandatory fix: broken url (error source: catalog.json): "url": "https://raw.githubusercontent.com/charliermarsh/ruff/main/ruff.schema.json" expected for ruff entry.
Note: check how it's done for markdownlint, I guess the root of the problem is here.

[charliermarsh]

I'd prefer not to change this. Copying over my comment from the Ruff issue (astral-sh/ruff#1765):

Unfortunately, the Schema Store doesn't support URLs for embedded schemas. So we can't point it to a URL if we want the schema to appear for pyproject.toml files. I initially implemented it as a URL (#2673), then intentionally changed it to bundle in the repo to support pyproject.toml files (#2683). It's an unfortunate limitation, but for now we have to update it periodically.

[not-my-profile]

Unfortunately, the Schema Store doesn't support URLs for embedded schemas.

Is there some tracking issue for that limitation?

[charliermarsh]

Not sure, but here's the relevant section in the docs. (Tests will also fail if you try to use an external schema.)

[not-my-profile]

I just filed #2731 for this :)