Prevent Docker from passing proxy to container

General
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According to the official Docker documentation, proxy related envionment variables of the host are readily available as build arguments. My situation is the following:

  • Host machine has no environment proxy variables, but has a proxy configuration in ~/.docker/config.json
  • Dockerfile for the images makes no use of the proxy build arguments nor envionment variables
  • Containers have proxy environment variables setted with the values configured in the ~/.docker/config.json

I don’t want the proxy variables in the container, why are they being configured? How can I prevent this from happening?

I’m using as a base image php:7.3-apache-buster. It’s Dockerfile doesen’t seem to have any use of the proxy env variables. Could the problem be with their image?

I get this problem running containers with docker run and docker-compose up, but the variables are not in the containers if I use docker stack deploy.