KubeOne: update doc about configuring OIDC

[vgramer]

doc : https://docs.kubermatic.com/kubeone/v1.6/tutorials/creating-clusters-oidc/

The documentation is a bit outdated as the cert-manager chart does not deploy ClusterIssuer anymore. Moreover, a customer was wondering how to use a self-signed CA.

TODO:

• add deployment of ClusterIssuer
• add an explanation about how to use a self-signed CA

[kubermatic-bot]

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[embik]

/remove-lifecycle stale

[kubermatic-bot]

Issues go stale after 90d of inactivity.
After a furter 30 days, they will turn rotten.
Mark the issue as fresh with /remove-lifecycle stale.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[kubermatic-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
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/lifecycle rotten

[embik]

/remove-lifecycle rotten

[kubermatic-bot]

Issues go stale after 90d of inactivity.
After a furter 30 days, they will turn rotten.
Mark the issue as fresh with /remove-lifecycle stale.

If this issue is safe to close now please do so with /close.

/lifecycle stale