Well that is a docker issue as the database and farmOS are in different containers.
You’ll need to enter the host address for the database under advanced options.
localhost or 127.0.0.1 won’t work as it will only direct to the farmOS containers own internal docker address.
172.17.0.1 should work as it is the Docker-host/Bridge address.
Or if you use docker-compose you can just use the hostnames.
If you need more help getting this going maybe we should move to a new thread and leave this one to discuss the new release.