flakes: split sources

[wegank]

This PR splits flakes/manual.toml into multiple files under flakes/manual/, and modifies .github/workflows/check-flake-files.yml so that it only runs on the modified files.

[github-actions]

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[dasJ]

Hey, sorry this took me so long to take a look at.

I really like the direction this is going. This does however only address the PR checks and not the actual import. That would be where the actual issues surface when a downstream flake breaks. So I think we should loop over the groups in the import as well, write them to a yaml (maybe? it should at least be concat'able) and bulk-import that into ES.

[wegank]

Hey, sorry this took me so long to take a look at.

I really like the direction this is going. This does however only address the PR checks and not the actual import. That would be where the actual issues surface when a downstream flake breaks. So I think we should loop over the groups in the import as well, write them to a yaml (maybe? it should at least be concat'able) and bulk-import that into ES.

I've also lost track of the PR, but I think the one-line change in .github/workflows/import-to-elasticsearch.yml does exactly that?