Only run polygerrit lint tests on master

Change-Id: I46e9f1d51003eb9f31e5a94056f3d34ddcb0b34d
diff --git a/jenkins/gerrit-bazel-verifier-test.sh b/jenkins/gerrit-bazel-verifier-test.sh
index 8f79497..8fb5ddf 100755
--- a/jenkins/gerrit-bazel-verifier-test.sh
+++ b/jenkins/gerrit-bazel-verifier-test.sh
@@ -34,8 +34,11 @@
 
 if [[ "$MODE" == *"polygerrit"* ]]
 then
-  echo 'Running lint tests...'
-  bazel test //polygerrit-ui/app:lint_test --test_output errors
+  if [[ "$TARGET_BRANCH" == "master" ]]
+  then
+    echo 'Running lint tests...'
+    bazel test //polygerrit-ui/app:lint_test --test_output errors
+  fi
 
   if [ -z "$DISPLAY" ]
   then