Massimo

I'd love to help. But I never built any docker image, so I would be rather of little help. Anyway, I will try to learn how to modify a base...

Maybe this could help : https://www.reddit.com/r/linux/comments/ovuzcm/pihole_for_alpine_linux_x86_and_x86_64/

I set up my docker image based on alpine (with also unbound).. I know, there might be a lot of things that can be improved.. but it is a baseline....