Init and update submodules before building

Plugins may need to refer to other existing core
Gerrit plugins and thus would need their source
code available.

Change-Id: I620276137fafaff1d02c07324ac9701a4754c09c
3 files changed
tree: ec4ec6f61f025a6264bc0c5acc1cd13492e38021
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore