Enable Docker Registry debug endpoint #16
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in the REST response on /v2/ on some occasions when the storage backend is inaccessible
too optimistic in that registries can get ready on start and the unready again because storage never started to work
something like 30s start to fail because storage didn't go up
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We have https://docs.docker.com/registry/configuration/#health enabled for the s3 driver but no https://docs.docker.com/registry/configuration/#debug endpoint. When storage fails the endpoint can provide details to why registry is unready, such as GCS authentication or connection refused on minio port 9000.
The registry container doesn't have curl so extracting this information is nontrivial. I'm relucant to add another port to forward. Running a curl job in-cluster is a practical option, which is why the debug server is binding to 0.0.0.0 instead of localhost.