Build readonly plugin for stable-3.2

Change-Id: I3e0e91b87232afe04aee55d2e2ffca194170a33b
diff --git a/jenkins/gerrit-bazel-plugin-readonly.yaml b/jenkins/gerrit-bazel-plugin-readonly.yaml
index abeaa58..ee3fd95 100644
--- a/jenkins/gerrit-bazel-plugin-readonly.yaml
+++ b/jenkins/gerrit-bazel-plugin-readonly.yaml
@@ -1,9 +1,15 @@
 - project:
     name: readonly
     jobs:
-      - 'plugin-{name}-bazel-{branch}':
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
           branch:
             - master
+          gerrit-branch:
+            - master
+            - stable-3.2
+
+      - 'plugin-{name}-bazel-{branch}':
+          branch:
             - stable-3.1
             - stable-3.0
             - stable-2.16