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## Summary
- replace the prepare-stage workspace cache with a single stash
- replace the test-stage mutable cache restore with unstash for each
matrix shard
- preserve dotfiles and repo metadata in the stashed workspace via
useDefaultExcludes: false

## Testing
- git diff --check

Ref: FLA-171
</comment><date>2026-06-05 10:02:00 +0000</date><id>a169c50bc1ef537886ffbfec28c40b24a25de4a4</id><msg>ci(ticdc): replace workspace cache with stash for heavy mysql IT (#4658)</msg><path><editType>edit</editType><file>pipelines/pingcap/ticdc/latest/pull_cdc_mysql_integration_heavy/pipeline.groovy</file></path></item><kind>git</kind></changeSet><culprit><absoluteUrl>https://do.pingcap.net/jenkins/user/noreply</absoluteUrl><fullName>noreply</fullName><id>noreply</id></culprit></freeStyleBuild>