[#389] Proper haddock check in ci
Description
Problem: Haskell.nix moved haddock building to a separate derivation at some point in time, thus we weren't testing it in CI.
Solution: Add dedicated haddock check to test-extras
stage in CI.
Related issue(s)
Resolves #389 (closed)
✅ Checklist for your Merge Request
Related changes (conditional)
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Tests (see short guidelines)
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If I added new functionality, I added tests covering it. -
If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
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Documentation
Stylistic guide (mandatory)
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My commits comply with the following policy. -
My code complies with the style guide.
Edited by Roman Melnikov