Update DOCKER_REGISTRY_URL to the recommended one #1334
Merged
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The recommended hostname ( docker/hub-feedback#2113 (comment) ) for docker registry is
https://registry-1.docker.io
.This was fixed on mybinder deployment jupyterhub/mybinder.org-deploy#1937, updating the URL here so people depending on dockerhub in their own binderhub deployments don't hit this issue.