Build reject-private-submit plugin against 3.0-3.3

Change-Id: If1afd2df0ca60cd7b63277dc799fd418cb8ca548
diff --git a/jenkins/gerrit-bazel-plugin-reject-private-submit.yaml b/jenkins/gerrit-bazel-plugin-reject-private-submit.yaml
index d115a5d..a980385 100644
--- a/jenkins/gerrit-bazel-plugin-reject-private-submit.yaml
+++ b/jenkins/gerrit-bazel-plugin-reject-private-submit.yaml
@@ -1,6 +1,13 @@
 - project:
     name: reject-private-submit
     jobs:
-      - 'plugin-{name}-bazel-{branch}':
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
           branch:
             - master
+          gerrit-branch:
+            - master
+            - stable-3.3
+      - 'plugin-{name}-bazel-{branch}':
+          branch:
+            - stable-3.2
+            - stable-3.1