add storage access configuration

[wildpcww]

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• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

Add storage access configuration for backup and restore

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• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
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• v6.1 (TiDB 6.1 versions)
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[gemini-code-assist]

Summary of Changes

Hello @wildpcww, I'm Gemini Code Assist¹! 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 introduces essential documentation for configuring storage access credentials for TiDB Cloud's backup and restore features. It provides clear, step-by-step instructions for both AWS S3 and Alibaba Cloud OSS, focusing on secure practices like using IAM/RAM users and granting least-privilege permissions. This enhancement aims to improve user experience and security when integrating TiDB Cloud with external cloud storage for data management.

Highlights

• Storage Access Configuration Documentation: New comprehensive documentation has been added to guide users on configuring secure storage access for backup and restore operations in TiDB Cloud.
• AWS S3 Access Key Setup: Detailed instructions are now available for setting up AWS S3 access keys, including creating IAM users, generating access keys, and defining granular permissions with an example JSON policy for data restoration.
• Alibaba Cloud OSS Access Key Setup: New guidance is provided for configuring Alibaba Cloud Object Storage Service (OSS) access, covering RAM user creation, AccessKey pair generation, and custom policy definition for restore operations.

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[gemini-code-assist]

Code Review

This pull request adds documentation for configuring storage access for backup and restore operations. The changes are clear and add valuable information for users. I've provided a few suggestions to improve formatting, consistency, and technical accuracy, including fixing an invalid JSON example and adding a missing permission. Overall, this is a great addition to the documentation.

[gemini-code-assist]

Please remove the extra blank line for better readability. One blank line is sufficient to separate the tip from the next step.

[gemini-code-assist]

For consistency with other tip blocks, please add a colon after **Tip**.

Suggested change

	> **Tip**
	> **Tip:**

[ti-chi-bot]

@grovecai: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

@wildpcww: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	2ad5028	link	true	/test pull-verify

Full PR test history. Your PR dashboard.

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