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Automatic merge from submit-queue Prep for continuous Docker validation test ```release-note Add a test config variable to specify desired Docker version to run on GCI. ``` We want to continuously validate Docker releases (#25215), on GCI. This change adds a new test config variable, `KUBE_GCI_DOCKER_VERSION`, through which we can specify which version of Docker we want to run on the master and nodes. This change also patches the Jenkins e2e-runner with the ability to fetch the latest Docker (pre)release, and sets the aforementioned variable accordingly. Tested on my local Jenkins instance that was able to start a cluster with the latest Docker version (different from installed version) running on both master and nodes. @dchen1107 Can you review? cc/ @andyzheng0831 for changes in `cluster/gce/gci/helper.sh`, and @ixdy @spxtr for changes to the Jenkins e2e-runner cc/ @kubernetes/goog-image