Whitelisting jekyll-webpack

I'm working with gh-pages v228. I want to publish a Jekyll site with some React code bundled with a webpack. Locally I'm using [jekyll/webpack](https://github.com/tevio/jekyll-webpack/) plugin.

Locally it works (e.g. my blog has webpack dependencies - see [repo](https://github.com/VorontsovIE/VorontsovIE.github.io)) and bundles my webpage even in live reloading mode.
But it doesn't work on a hosted version, thus I need to manually bundle my source code and put bundled files under a git supervision.
Nothing critical, but I think it'd be more convenient to bundle code on a github server.

The issue names the jekyll/webpack plugin and links to an example repository. Start by reviewing pages-gem's current plugin allowlist and hosted-build handling, then compare the plugin's requirements with supported GitHub Pages dependencies. Done means the requested plugin can be evaluated for hosted bundling without requiring manually committed bundles.

Written by the indexing model from the issue text.