Xavier this discussion is about multi-tenant installations, where the same code is used for multiple different websites with their own separate databases.
Making a single forum accessible through multiple URLs is not recommended as it will negatively impact your SEO score in many search engines. This can be achieved by dynamically setting the url
value inside of the unique config.php
file, switching between config files will also work but is not necessary if the domain is the only difference. I think there exist other discussions about this on the forum. Otherwise, please start a new one so we can keep things organized.