Solves runtime deployment issue at the helm chart. hostNetwork was not set.

[angelbarrera92]

What this PR does / why we need it:

I am testing the chart locally (using kind). And I found the deployment didn't expose the port as a host port.
This is required to let the api-server reach this pod to authenticate requests.

I guess this was forgotten as the deployment available under config/samples have it: https://github.com/gardener/oidc-webhook-authenticator/blob/master/config/samples/deployment.yaml#L90

Which issue(s) this PR fixes:
Not opened yet, i can open one if it is required.

Special notes for your reviewer:
Im writing some docs to demonstrate how to make it working on a kind (locally) k8s cluster. Let me know if you want to publish it somewhere :)

Release note:

Solves runtime deployment issue at the helm chart. `hostNetwork` was not set.

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[gardener-robot]

@angelbarrera92 Thank you for your contribution.

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[dimityrmirchev]

@angelbarrera92 thanks for opening this PR, however sharing the host network is something that we do not want for a productive scenario. I opened a PR that will allow setting the clusterIP through the helm charts. This will allow the kube-apiserver to directly call the service via its IP if that is required, i.e. OWA is deployed in the same k8s cluster and the kube-apiserver cannot use in-cluster dns.