fix: use CI=1 for tidb make command

[xhebox]

No description provided.

[ti-chi-bot]

Hi @xhebox. Thanks for your PR.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-15 05:16:21.373610155 +0000 UTC m=+235577.788214219: ☑️ agreed by hawkingrei.

[purelind]

/lgtm

[ti-chi-bot]

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This pull-request has been approved by: hawkingrei, purelind

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