feat(ci): add doc validation script

Makefile

@@ -79,6 +79,7 @@ test-unit:
 test-style:
 	@scripts/validate-go.sh
 	@scripts/validate-license.sh
+	@scripts/validate-generated-docs.sh
 
 .PHONY: protoc
 protoc:

scripts/validate-generated-docs.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# Copyright 2016 The Kubernetes Authors All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+set -euo pipefail
+
+echo "==> Running generated docs validations <=="
+
+make docs > /dev/null
+
+status="$(git status --porcelain -- ./docs)"
+if [[ -n "${status}" ]]; then
+  echo
+  echo "Auto generated docs are outdated. Run `make docs`"
+  echo
+  exit 1
+fi