GOAF image used from https://hub.docker.com/r/pdok/wfs-3.0, this is an older version, but PDOK has not updated yet. Alternative could be to build the image from sources.
GOAF supports a PostGres or GeoPackage backend. Which file to serve the type of file are injected as environment variables.
We have added the default BRT image provided by PDOK as example.