Our first tutorial in the QGIS Actions series focuses on how to consume services with your point data. You will learn how to generate random points in your polygon and send their coordinates to the HERE Maps Reverse Geocoder API.
If you simply want to run Valhalla within a docker container, then feel free to dive into this tutorial. However, to understand the individual steps being called in the provided Dockerfile please refer to part 1 and 2 of this Valhalla Routing series of tutorials.