deac60d1

By: Michael Lynch <git@mtlynch.io>

Fix check-frontend to pre-fetch npm deps with buildNpmPackage

The previous mkBuildStep ran `npm install` at build time, which silently
failed because there is no network access in the Nix sandbox. The frontend
checks appeared to pass but never actually ran.

Switch to buildNpmPackage so npm dependencies are fetched in a
fixed-output derivation. Extract npmDepsHash as a shared variable used by
both check-frontend and e2e-tests.

Co-authored-by: Shelley <shelley@exe.dev>

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