Build and deploy blockly-games fork

Hello,
I’m trying to fork project blockly-games from google at github.

I’m working with children and looking for ways to make them discover block languages progressively, like at code.org, because scratch.mit.edu is difficult on first approche.

I copied content of project in public folder of https://gitlab.com/garagenum/blockly , set gitlab-ci.yml to build app and then serve artifacts but after jobs , I have a blank screen at https://garagenum.gitlab.io/blockly/appengine/index.html .

Everythings works on my local copy…

Thank you for your help.