Allow prefix to be a whitespace/comma separated list of prefixes #326
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This project enables pushing the same image to multiple tags, and with this feature it can enable pushing the same image to multiple destinations with multiple tags.
A use case for this is if we want to push to both Docker Hub and Quay.io for example, then prefix could be
"user/repo,quay.io/user/repo"
.I'd like us to not drop docker hub entirely and instead push to quay.io alongside dockerhub if its easy enough, and this makes it easy enough I think. I imagine it makes this small change possible in jupyterhub/configurable-http-proxy's publish workflow for example.