Enable change validation for the multi-site plugin

Change-Id: Ibaebeb93208308f0c3fa88e1d2d385c9f582b61b
diff --git a/jenkins/gerrit-bazel-plugin-multi-site.yaml b/jenkins/gerrit-bazel-plugin-multi-site.yaml
index cf14fd9..a54e728 100644
--- a/jenkins/gerrit-bazel-plugin-multi-site.yaml
+++ b/jenkins/gerrit-bazel-plugin-multi-site.yaml
@@ -12,3 +12,4 @@
             - stable-3.1
             - stable-3.0
             - stable-2.16
+      - 'plugin-{name}-verifier'