heathcliff26 / kube-upgrade / 19393426312

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github

upgrade-controller: Use validating webhook to ensure only a single plan exists

There should only ever be a single KubeUpgradePlan in the cluster at any time.
To enforce this, add a validating webhook that checks for existing plans
when a new plan is created, and rejects the creation if one already exists.

Closes: #187

Signed-off-by: Heathcliff <heathcliff@heathcliff.eu>

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