feat: validation of required feature gate at start (#72) #64

	# Copyright 2023 Google LLC
	#
	# 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
	#
	# https://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,
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	name: Documentation checks
	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	linting:
	name: Documentation linting
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	python-version: 3.9
	- name: Check license headers
	run: python3 scripts/license_header_check.py $GITHUB_WORKSPACE
	- name: Markdown linter
	uses: avto-dev/markdown-lint@v1
	with:
	config: '.markdownlint.yml'
	args: '*/.md'
	- name: Markdown links
	uses: gaurav-nelson/github-action-markdown-link-check@v1
	with:
	config-file: '.mlc_config.json'
	base-branch: main

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