Inspired by https://github.com/PDOK/mapproxy-docker, a container that runs mapproxy with very little wrapping.
Builds for ARM64 and AMD64 are available at ghcr.io/katlol/mapproxy
It exposes port 8000, you might want to mount /app/mapproxy.yaml to your configuration.
It is built on Python 3.11 and the latest mapproxy version / dependencies using Gunicorn.