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Upgrade/Downgrade and Scale Up/Down of a CockroachDB cluster on Kubernetes

Continuing my learning CockroachDB on Kubernetes set from: I take some DBAs through: * Patching of CockroachDB * Adding more nodes to a CockroachDB to scale up * Decommissioning nodes to safely scale down a CockroachDB cluster. This builds on the great instructions from Alex Robinson ( * *