Add changefeed azure blob support.

[ginkgoch]

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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 user guide for changefeed to sink data to Azure Blob.

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[ti-chi-bot]

Hi @ginkgoch. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[gemini-code-assist]

Summary of Changes

Hello @ginkgoch, 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 expands the TiDB Cloud documentation by adding a new section that guides users through the process of configuring changefeeds to utilize Azure Blob storage as a data sink. It covers the necessary setup within the Azure portal, including container creation and SAS token generation, and then details how to integrate these settings into the TiDB Cloud console.

Highlights

• Azure Blob Storage Support: Introduces detailed documentation for configuring TiDB Cloud changefeeds to sink data to Azure Blob storage.
• Azure Configuration Steps: Provides step-by-step instructions for setting up an Azure container, obtaining its URL, and generating a Shared Access Signature (SAS) token.
• SAS Token Management: Emphasizes the importance of specific permissions (Read, Write, Delete, List, Create) and managing the validity period of the SAS token, including notes on its non-revocability and renewal.
• TiDB Cloud Console Integration: Guides users on how to input the Blob URL and SAS Token into the TiDB Cloud console's Changefeed Destination configuration.

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[gemini-code-assist]

Code Review

This pull request adds documentation for using Azure Blob Storage as a sink for changefeeds. The changes are well-structured and provide clear, step-by-step instructions. I've made a few suggestions to improve clarity, correct a factual detail, and align the text more closely with the documentation style guide. My feedback is based on the principles of technical accuracy, clarity, and conciseness as outlined in the repository's style guide.

[ti-chi-bot]

@WangLe1321: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[hfxsd]

/ok-to-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please ask for approval from hfxsd. For more information see the Code Review Process.
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[ti-chi-bot]

@ginkgoch: 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	9e91a7f	link	true	/test pull-verify

Full PR test history. Your PR dashboard.

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