Build pull-replication against gerrit stable-3.6

Bug: Issue 15831
Change-Id: I5063e684c7313cf77c72bc26904fe1d8b0953995
diff --git a/jenkins/gerrit-bazel-plugin-pull-replication.yaml b/jenkins/gerrit-bazel-plugin-pull-replication.yaml
index 5cbc9b9..02ec84e 100644
--- a/jenkins/gerrit-bazel-plugin-pull-replication.yaml
+++ b/jenkins/gerrit-bazel-plugin-pull-replication.yaml
@@ -10,5 +10,6 @@
           branch:
             - master
           gerrit-branch:
+            - stable-3.6
             - stable-3.5
       - 'plugin-{name}-verifier'