docs: replace deprecated PingCAP domains

[wuhuizuo]

What problem does this PR solve?

Issue Number: ref #67527

Problem Summary:

download.pingcap.org is being deprecated in favor of download.pingcap.com, and release-7.5 still has old-domain references in Dumpling install/docs and BR test download helpers.

What changed and how does it work?

• backport the domain migration from master to release-7.5
• replace deprecated download.pingcap.org references with download.pingcap.com in br/tests/download_tools.sh, dumpling/README.md, and dumpling/install.sh
• preserve the existing release-7.5-specific script behavior while only changing the download host

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Manual test steps:

• git diff --check
• verify no remaining old-domain references in br/tests/download_tools.sh, dumpling/README.md, and dumpling/install.sh
• curl -I https://download.pingcap.com/tiflash-nightly-linux-amd64.tar.gz
• curl -I https://download.pingcap.com/tidb-nightly-linux-amd64.tar.gz
• curl -I https://download.pingcap.com/ticdc-nightly-linux-amd64.tar.gz
• curl -I http://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz
• curl -I https://download.pingcap.com/tidb-toolkit-latest-linux-amd64.tar.gz
• curl -I http://download.pingcap.com/tidb-toolkit-nightly-linux-amd64.tar.gz

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

none

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[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 assign leavrth, lichunzhu for approval. For more information see the Code Review Process.
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Details

Needs approval from an approver in each of these files:

• br/OWNERS
• dumpling/OWNERS

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[coderabbitai]

📝 Walkthrough

Walkthrough

Updated download hosts in multiple scripts and docs: references to download.pingcap.org were changed to download.pingcap.com. No other logic, extraction, or file-placement operations were modified.

Changes

Cohort / File(s)	Summary
BR test script br/tests/download_tools.sh	Replaced https://download.pingcap.org/... with https://download.pingcap.com/... for nightly binaries (tiflash, tidb bundle via MISSING_TIDB_COMPONENTS, ticdc). Extraction and cleanup unchanged.
Dumpling README dumpling/README.md	Updated example/instructions download URLs from .org to .com for bin/sync_diff_inspector, bin/tidb-server, and bin/tidb-lightning.
Dumpling install script dumpling/install.sh	Changed wget source for tidb-toolkit-$TOOLS_TAG-linux-amd64.tar.gz from download.pingcap.org to download.pingcap.com; extraction and mv bin/* unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hopped from .org to .com today,
URLs rebounded in a merry display,
Tarballs untouched, extracts still the same,
A tiny domain hop, but the workflow's flame,
Nibble, test, and then away I play.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'docs: replace deprecated PingCAP domains' clearly summarizes the main change—updating download URLs from deprecated .org domain to .com domain across documentation and scripts.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description provides a clear problem statement, itemized changes, manual test steps, and follows the required template structure with completed sections.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/update-pingcap-domains-release-7-5

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[coderabbitai]

🧹 Nitpick comments (1)

dumpling/README.md (1)

37-39: Inconsistent protocol: http:// vs https://.

Line 37 uses http:// while lines 38-39 use https://. Consider using https:// consistently for all download URLs unless the enterprise-tools endpoint specifically requires HTTP.

Suggested fix

-    * `bin/sync_diff_inspector` (download from [tidb-enterprise-tools-latest-linux-amd64](http://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz))
+    * `bin/sync_diff_inspector` (download from [tidb-enterprise-tools-latest-linux-amd64](https://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz))

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@dumpling/README.md` around lines 37 - 39, Update the README entry for
`bin/sync_diff_inspector` to use HTTPS like the other links: replace the
`http://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz`
URL with
`https://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz`
so the `bin/sync_diff_inspector` bullet uses the same secure protocol as the
`bin/tidb-server` and `bin/tidb-lightning` entries.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@dumpling/README.md`:
- Around line 37-39: Update the README entry for `bin/sync_diff_inspector` to
use HTTPS like the other links: replace the
`http://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz`
URL with
`https://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz`
so the `bin/sync_diff_inspector` bullet uses the same secure protocol as the
`bin/tidb-server` and `bin/tidb-lightning` entries.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: a2286db8-c750-44db-8977-1f36ae385755

📥 Commits

Reviewing files that changed from the base of the PR and between 81d74e6 and 5a0954f.

📒 Files selected for processing (3)

• br/tests/download_tools.sh
• dumpling/README.md
• dumpling/install.sh

[ti-chi-bot]

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

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	f7df120	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	f7df120	link	true	/test check-dev

Full PR test history. Your PR dashboard.

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