Hi Nicolas,
the trusted SSL Certificate is an Android/iOS limitation, we can't change that.
You can just use the browser for the early stages of development and then test the development in your production server.
See: https://docs.moodle.org/dev/Moodle_Mobile_development_using_Chrome_or_Chromium
Or, you can hack your internal server config.php so it also works via http (changing the wwwroot dinamically)
Regards, Juan