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GCP: pushing GKE images into gcr.io to avoid pull rate limits

Docker hub now enforces pull rate limits (since November 2020).  And unfortunately, this limit is often reached at critical moments such as upgrades or infrastructure events when bulk pod recreation is happening. One way to avoid this problem is to place your images into an alternate image registry.  This could mean a lot of work GCP: pushing GKE images into gcr.io to avoid pull rate limits