Use bazelisk on Docker build slave agents

Use the new bazelisk utility that allows to automatically
switch the bazel version on the Gerrit builds.

Allow an easier transition between bazel releases for the different
branches of Gerrit, making the warm-up also easier to run and more
up-to-date with the latest and greatest of the bazel version used.

Change-Id: Ie1a8bb11060085e9e101f625114a9bc9d8130357
3 files changed
tree: 6e7cbd7123d5bd60d4417e29ea79f1c2918944ea
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore