Build branch-network plugin on stable-3.3

Change-Id: Iafa9c2ec875fbe605d39129f83786a7098abaebe
diff --git a/jenkins/gerrit-bazel-plugin-branch-network.yaml b/jenkins/gerrit-bazel-plugin-branch-network.yaml
index ec7da36..b463246 100644
--- a/jenkins/gerrit-bazel-plugin-branch-network.yaml
+++ b/jenkins/gerrit-bazel-plugin-branch-network.yaml
@@ -5,5 +5,8 @@
           branch:
             - master
           gerrit-branch:
-            - master
+            - stable-3.3
             - stable-3.2
+      - 'plugin-{name}-bazel-{branch}':
+          branch:
+            - master