ci: added a link checker for markdown files #1

	# Copyright 2025 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,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
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	name: Lint Markdown

	on:
	pull_request:
	branches: [ main ]

	jobs:
	link-check:
	name: Run link check
	runs-on: ubuntu-latest
	steps:
	- name: Check out code
	uses: actions/checkout@v4

	- name: Link Checker
	uses: lycheeverse/[email protected]
	with:
	# There is no security token. So, it would fail on any links which aren't public.
	args: "--verbose --no-progress **.md"

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