Build zookeeper-refdb plugin on stable-3.4 branch

Change-Id: If9ee23e9e2b0baeab10f5ae20dd5cc2827d24d06
diff --git a/jenkins/gerrit-bazel-plugin-zookeeper-refdb.yaml b/jenkins/gerrit-bazel-plugin-zookeeper-refdb.yaml
index 12f5d5f..c4563af 100644
--- a/jenkins/gerrit-bazel-plugin-zookeeper-refdb.yaml
+++ b/jenkins/gerrit-bazel-plugin-zookeeper-refdb.yaml
@@ -1,14 +1,21 @@
 - project:
     name: zookeeper-refdb
     jobs:
-      - 'plugin-{name}-bazel-{branch}':
-          branch:
-            - stable-3.1
-      - 'plugin-{name}-bazel-{branch}':
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
           targets: "plugins/{name}:{name} plugins/{name}:{name}-zk-3.5"
           branch:
             - master
+          gerrit-branch:
+            - master
+            - stable-3.4
+          extra-artifacts: 'bazel-bin/plugins/{name}/{name}-zk-3.5.jar'
+      - 'plugin-{name}-bazel-{branch}':
+          targets: "plugins/{name}:{name} plugins/{name}:{name}-zk-3.5"
+          branch:
             - stable-3.3
             - stable-3.2
           extra-artifacts: 'bazel-bin/plugins/{name}/{name}-zk-3.5.jar'
+      - 'plugin-{name}-bazel-{branch}':
+          branch:
+            - stable-3.1
       - 'plugin-{name}-verifier'