Build gitiles plugin stable-2.15 separately

Change-Id: I4b0014874d1ee18e584a0a2568843e8b7c97c6b5
1 file changed
tree: 6d28f0f8dd7f7de1d11509dbac9af961ee8d6ba2
  1. jenkins/
  2. jenkins-docker/
  3. .gitignore