Switch away from authProxy in favor of NetworkPolicies (Kubebuilder deprecation)

[frittentheke]

Feature Description

Kubebuilder is discontinuing the use of Kube RBAC Proxy in favor of NetworkPolicies, see kubernetes-sigs/kubebuilder#3871

Suggested Solution (optional)

When switching to creating network policies, it might

Already existing or connected issues / PRs (optional)

While not immediately related to using a NetworkPolicy to protect the /metrics endpoints the same endpoint is also used to control (e.g. start / stop) the k6 instances. It might make sense to also add a NetworkPolicy protecting the runner pods from being contacted by any other source but the operator.

Related issues:

• Remove starter job in favor of built-in implementation #87 (comment)
• Networking improvements #186

[yorugac]

Hi @frittentheke, thanks for the issue! ATM, I hope this might be resolved with #235 actually 😄
For now, we can keep this open: let's see how it shapes up in the future 👍