Clarify potential security issues around open cluster access

[omrishiv]

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What is the outcome that you are trying to reach?

We need to clarify the potential security issues around running open clusters. For instance: https://arstechnica.com/security/2024/03/thousands-of-servers-hacked-in-ongoing-attack-targeting-ray-ai-framework/

Describe the solution you would like

Let's update the documentation to clarify potential sources of issues.

[github-actions]

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