`hera.json` not found

When deployed on GitLab pages, Hecate doesn't found the database resources file hera.json.

Steps to reproduce:

1. go to https://datasphere.gitpages.huma-num.fr/hecate/app/
2. in the burger menu, click on "Databases" > "Pet shop" > any view ...

... you'll get a 404 XmlHttpRequest error.