Also allow validation of client certificates (mTLS)

[maxsmythe]

It'd be nice if we also allowed validation of client certificates.

It looks like this could be done by providing the same pattern we use for for GetCertificate to GetClientCertificate:

controller-runtime/pkg/webhook/server.go

Lines 172 to 175 in 18d591a

	cfg := &tls.Config{
	NextProtos: []string{"h2"},
	GetCertificate: certWatcher.GetCertificate,
	}

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@fejta-bot: Closing this issue.

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[maxsmythe]

/reopen

being able to authenticate the API server would close the loop for sensitive webhooks.

[k8s-ci-robot]

@maxsmythe: Reopened this issue.

In response to this:

/reopen

being able to authenticate the API server would close the loop for sensitive webhooks.

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/close

[k8s-ci-robot]

@fejta-bot: Closing this issue.

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[maxsmythe]

/reopen

still valuable