When you launch a new intallation on Scaleway, your script gets stalled, because it's actually waiting for an input, that you can see only if you
tail -f /var/log/cloudron-setup.log
in another terminal. Tailing so is mentioned when you launch the script, but it might be a good thing to also mention it in the doc (https://cloudron.io/documentation/installation/) .
In this second terminal you are presented with the configuration window of libssl1.1. (see https://framadrop.org/r/zT1Hpb_Gpv#RLhN9KT0E1thH8/a/6UWftNLxAN+slsmEeY5bOgtssM= )
So you have to type in the first terminal (basically just "Enter") to answer what you see in the second.
It's easy to workaround, but it's a little disorientating at first, so it might help to change it.