mysql: add customized release version config option

AilinKid commented 3 years ago

Signed-off-by: ailinkid 314806019@qq.com

What problem does this PR solve?

Add customized release version config option which will be initialized in the TiDB makefile.

What is changed and how it works?

Add customized release version config option which will be initialized in the TiDB makefile. Related-TiDB-PR https://github.com/pingcap/tidb/pull/27692

Check List

Tests

Manual test (add detailed scripts or steps below)

Related changes

Need to cherry-pick to the release branch

ti-chi-bot commented 3 years ago

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tangenta
zimulala

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tangenta commented 3 years ago

Can we move this constant to TiDB?

zimulala commented 3 years ago

/LGTM

pingcap / parser