Feature Request: Allow triggering data source fetching

[tiagogviegas]

Would be nice if there was an API to trigger a data source update and build bundles depending on this data source.

E.g. Instead of polling every data source each few seconds, we might only want it to fetch on demand (e.g via a webhook).

This would allow controlling the rate a data source if fetched and also allow for more frequent updates to the bundles, instead waiting for the worker to trigger the build.

[srenatus]

So with #124, you can trigger a bundle rebuild -- and that, as usually happens, will pull in the required data sources. Would that work?

There's currently no notion of "fetching data sources" outside of the bundle build process. It's all done for the build, not in preparation or in its own background loop.