Build uploadvalidator plugin for Gerrit v3.2

Change-Id: I3a7b855d84d2d2655ecb545f7757b2ac6590e356
diff --git a/jenkins/gerrit-bazel-plugin-uploadvalidator.yaml b/jenkins/gerrit-bazel-plugin-uploadvalidator.yaml
index 3bb4e17..1006c5c 100644
--- a/jenkins/gerrit-bazel-plugin-uploadvalidator.yaml
+++ b/jenkins/gerrit-bazel-plugin-uploadvalidator.yaml
@@ -10,4 +10,5 @@
             - master
           gerrit-branch:
             - master
+            - stable-3.2
             - stable-3.1