Build find-owners plugin on stable-3.2 and stable-3.3

Change-Id: I39221578f6ad83c1fb5349478a963cddb0f348c9
diff --git a/jenkins/gerrit-bazel-plugin-find-owners.yaml b/jenkins/gerrit-bazel-plugin-find-owners.yaml
index ff661bc..e5505f1 100644
--- a/jenkins/gerrit-bazel-plugin-find-owners.yaml
+++ b/jenkins/gerrit-bazel-plugin-find-owners.yaml
@@ -1,6 +1,12 @@
 - project:
     name: find-owners
     jobs:
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - stable-3.3
+            - stable-3.2
       - 'plugin-{name}-bazel-{branch}':
           branch:
             - master