Build code-owners plugin on stable-3.4 branch

Change-Id: I42b79b854967c2e0120c53a0f6d0eb030a79f6b9
diff --git a/jenkins/gerrit-bazel-plugin-code-owners.yaml b/jenkins/gerrit-bazel-plugin-code-owners.yaml
index 8794cd0..28fb3a3 100644
--- a/jenkins/gerrit-bazel-plugin-code-owners.yaml
+++ b/jenkins/gerrit-bazel-plugin-code-owners.yaml
@@ -5,3 +5,8 @@
           branch:
             - master
             - stable-3.3
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - stable-3.4