Don't build gitblit on Gerrit 2.13

GitBlit's Lucene version isn't compatible with the
one in Gerrit 2.13. Even if it builds correctly, it
would never work.

Having a binary available on the CI would be misleading
people in trying to use it.

Change-Id: I87778c648f6a01d3a71e0ae48441f26076e5c446
1 file changed
tree: 657db5b0c7fb813c53b0e67082d6a7177f022397
  1. jenkins/
  2. jenkins-docker/
  3. .gitignore