feat: add read-only proxy

[jcpunk]

A number of folks (myself included) are fond of the skip-login button from the previous versions.

I'm glad for the move to the new, better auth. However, a number of my users have asked after the simple read-only view they once had.

This PR adds a fairly naive proxy container which sets the Authorization header to a specially created read-only user.

There are probably more things to template, maybe network policies to enforce, and tls to attach. But for a quick and simple "Give me a read-only view" this works for my site.

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[jcpunk]

/remove-lifecycle stale

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[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the PR is closed

You can:

• Mark this PR as fresh with /remove-lifecycle stale
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• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/lifecycle rotten