playground: add warning for deletion of data dir

[xhebox]

Signed-off-by: xhe [email protected]

What problem does this PR solve?

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

TiDB Playground Cluster will delete all data after exit. Please use --tag xx to pin the data dir.

🎉 TiDB Playground Cluster is started, enjoy!

Connect TiDB:    mysql --host 127.0.0.1 --port 4000 -u root

• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[bb7133]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-16 08:22:51.990402029 +0000 UTC m=+858762.079204572: ☑️ agreed by bb7133.
• 2024-12-16 11:01:14.307848385 +0000 UTC m=+868264.396650928: ✖️🔁 reset by xhebox.
• 2024-12-20 06:44:15.659429619 +0000 UTC m=+1198445.748232159: ☑️ agreed by kaaaaaaang.