🐛 add manager.Options.WebhookServer so webhook server can be set

[estroz]

This PR adds pkg/manager.Options.WebhookServer to allow external configuration of a webhook server. Currently there is no way to add a custom webhook server, since Manager.Add() will not set controllerManager.webhookServer. I am treating this as a bug since the manager's internals appear to allow external webhook configuration, but no code API was ever exposed to allow this.

/kind bug

Signed-off-by: Eric Stroczynski ericstroczynski@gmail.com

[estroz]

/cc @vincepri @alvaroaleman

[estroz]

There are probably a few ways to add a webhook server. This method preserves most existing logic without requiring injection, so I figured it is the easiest/forward-compatible way.

[coderanger]

/lgtm

[cndoit18]

/LGTM

[k8s-ci-robot]

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[vincepri]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cndoit18, estroz, vincepri

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