Add uploadvalidator plugin to the check pipeline

Change-Id: I3d92fe5911ccef0128da014574c485785b4a9080
diff --git a/zuul.d/projects.yaml b/zuul.d/projects.yaml
index 76e1d23..573ed8d 100644
--- a/zuul.d/projects.yaml
+++ b/zuul.d/projects.yaml
@@ -223,3 +223,9 @@
     check:
       jobs:
         - gerrit-plugin-build
+
+- project:
+    name: plugins/uploadvalidator
+    check:
+      jobs:
+        - gerrit-plugin-build