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Figure it out by using

--gradle-user-home

via this post https://blog.jdriven.com/2021/11/reuse-gradle-build-cache-on-gitlab/

Gradle template use the env var GRADLE_USER_HOME https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Gradle.gitlab-ci.yml#L20

Good to know. Thank you!