push-cache was only printing the main invoiceninja package's out path, so
the ui derivation (exposed via passthru.ui) never actually reached the
cachix cache even though it gets built as a dependency.
The new update target (scripts/update-versions.sh) checks GitHub for the
latest invoiceninja release and the latest invoiceninja/ui tag, bumps
whichever changed in package.nix, and iteratively rebuilds -- parsing
each hash-mismatch error Nix reports for a fixed-output derivation -- to
fill in the correct src/npmDeps/vendor hashes automatically.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
