Don't always run gerrit build test jobs

Currently we build all branches of gerrit on any change to this repo.
Instead, only run those jobs when relevant files are changed.

Change-Id: I3a1ea503552313e0a53a96b7731c3fe425cc0a7b
1 file changed
tree: b682ad292c90ae7708e9889232a1dbe3a9067250
  1. .gitreview
  2. LICENSE
  3. README
  4. playbooks/
  5. roles/
  6. zuul.d/