scripts/test-infra: add step to verify Helm README

Author: marquiz

scripts/test-infra/verify.sh

@@ -77,3 +77,11 @@ if ! git diff --quiet; then
     echo "Helm validation schema is not in sync. Run 'make helm-schema' to update"
     exit 1
 fi
+
+# Check that the Helm README is in sync
+echo "Verifying Helm README"
+make helm-docs
+if ! git diff --quiet; then
+    echo "Helm README is not in sync. Run 'make helm-docs' to update"
+    exit 1
+fi