Dockerfile: Externalize buildifier and bazel versions

Change-Id: I475517c9ad8f291a017b22f12c129ee8b343d4c6
2 files changed
tree: e05a1550b4e15e5e2248cd23a405c472ba78bb6f
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore