Build github against gerrit stable-3.6

Bug: Issue 15831
Change-Id: If7f7b605ac841f71b4a47860ff3ba50e2551b81c
diff --git a/jenkins/gerrit-mvn-plugin-github.yaml b/jenkins/gerrit-mvn-plugin-github.yaml
index e8e2dc7..182f90c 100644
--- a/jenkins/gerrit-mvn-plugin-github.yaml
+++ b/jenkins/gerrit-mvn-plugin-github.yaml
@@ -3,6 +3,7 @@
     repo: github
     branch:
       - master
+      - stable-3.6
       - stable-3.5
       - stable-3.4
       - stable-3.3