Option to allow extending a file available at an HTTPS URL

[lengau]

The current extend configuration is great for large monorepos where we want to extend configuration from a higher level, but for teams that have multiple separate repos, but still want a unified base configuration, it would be useful to allow extend to extend a remote file (with that file being cached for offline use).

For example:

[tool.ruff]
extend = "https://raw.githubusercontent.com/canonical/starbase/v1/pyproject.toml"

This is similar to Mend Renovate's extends but without the complexity of converting repository descriptions to URLs.

[MichaReiser]

Thanks for opening this feature request. I'll merge it with #12352.

[lengau]

Thanks! I missed that when searching for dupes.