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[deploy] Allow disabling CockroachDB liveness and readiness probes - #1818
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This PR fixes #1732.
It adds options to disable the CockroachDB liveness and readiness probes in Terraform and Tanka. Since the upstream Helm chart always renders probes, the chart README documents how to replace them with a probe that always succeeds.
Probes stay enabled by default, so this should not change anything in existing clusters.
Tested in usual GKE/AWS tanka-helm deployment.