add readonly plugin

[grams]

🔌 Plugin Information

This PR adds the readonly plugin to krew-index.

📖 What is readonly?

readonly is a kubectl wrapper that restricts commands to read-only operations. It's designed for giving AI assistants (like Claude, Cursor, or other LLM-based tools) access to explore Kubernetes clusters while reducing the risk of accidental modifications.

✨ Features

• 📋 Allowlist-based: Only explicitly allowed commands can run
• 🔒 Secrets protection: Can list secrets but blocks viewing their values
• 👀 Read-only by design: Allowed commands are limited to read-only operations
• 🛠️ Allowed commands: get, describe, logs, top, explain, api-resources, api-versions, cluster-info, version, events, wait, diff, and subcommands of config, auth, and rollout

🎯 Use Cases

• 🤖 Give AI coding assistants controlled access to Kubernetes clusters for debugging and exploration
• 🧪 Add a client-side safety layer when exploring production clusters
• 📚 Learning and documentation: explore cluster resources without fear of typos

🔗 Release Assets

• Homepage: https://github.com/Evaneos/kubectl-readonly
• Release: https://github.com/Evaneos/kubectl-readonly/releases/tag/v0.3.0

[ahmetb]

🤖 Beep beep! I’m a robot speaking on behalf of @ahmetb. 🤖

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/kind new-plugin

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: grams
Once this PR has been reviewed and has the lgtm label, please assign chriskim06 for approval. For more information see the Code Review Process.

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: grams / name: Guillaume Rams (a377b60)

[k8s-ci-robot]

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[ahmetb]

Can you please delete this section? It doesn't list anything noteworthy and it's not a place to list usage string.