I asked on Twitter online_net to participate in their beta phase and got a discourse instance running (very performant) without paying so far (or even giving them credit card details). Thanks to http://online.net
Stats: C1 (4 Cores @1.3GHz, 2GB memory) + 20 GB SSD
It’s a small ARM dedicated server.
Sole disadvantage: Setup is a bit more complicated, because the docker image is not yet ARM compatible.
How-To setup docker on this cloud: Discourse InstantApp - Feedback - Online Scaleway - Community
If this offer is not going to be too expensive, this could become a nice alternative to digitalocean. Especially for people that feel unconfortable to host their data in a US enterprise cloud.