Super easy to run a docker cache proxy:

    docker run -d -p 6000:5000 \
    -e REGISTRY_PROXY_REMOTEURL=https://registry-1.docker.io \
    --restart always \
    --name registry registry:2

That's it. Now fetch docker images from the IP that command is running on. Taken from gitlab: https://docs.gitlab.com/runner/install/registry_and_cache_se...