Add admission policy documentation

[suyiiyii]

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[volcano-sh-bot]

Welcome @suyiiyii!

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[gemini-code-assist[bot]]

Summary of Changes

Hello @suyiiyii, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adds new documentation for Volcano's Validating Admission Policy (VAP) and Mutating Admission Policy (MAP). The documentation clarifies how these policies enhance resource validation and modification within Volcano, offering detailed guides on their installation via Helm or YAML, configuration, and usage. It also covers essential prerequisites and notes on the interplay between these new policies and existing webhooks, ensuring users can effectively implement and manage them.

Highlights

• New Admission Policy Documentation: Introduced comprehensive documentation for Volcano's Validating Admission Policy (VAP) and Mutating Admission Policy (MAP), explaining their role in validating and modifying Volcano resources.
• Installation and Configuration Guidance: Provided detailed instructions on how to enable VAP and MAP during Volcano installation using both Helm and direct YAML manifests, including specific configuration options.
• Usage and Verification Steps: Included practical steps for users to verify that VAP and MAP are active post-installation and demonstrated how to test validation with an example of an invalid job creation.
• Prerequisites and Limitations: Outlined the Kubernetes version prerequisites for VAP (1.30+) and MAP (1.32+) and highlighted important notes regarding MAP's partial functionality and its coexistence with existing Volcano webhooks.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[volcano-sh-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: To complete the pull request process, please assign william-wang You can assign the PR to them by writing /assign @william-wang in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment