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Markdown lint #1840

	name: Markdown lint

	on:
	schedule:
	- cron: '5 8 * * *'
	workflow_dispatch:
	pull_request:
	paths:
	- '**.md'
	- 'book/**'

	jobs:
	markdown-lint:
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v4
	- name: Lint
	run: make markdown-lint

	- name: Spell check
	run: pip install codespell && make -C book codespell

	- id: setup-chrome
	uses: browser-actions/setup-chrome@v2
	with:
	chrome-version: stable

	- name: Point Puppeteer at the installed Chrome
	run: echo "PUPPETEER_EXECUTABLE_PATH=${{ steps.setup-chrome.outputs.chrome-path }}" >> "$GITHUB_ENV"

	- uses: umbrelladocs/action-linkspector@v1
	with:
	fail_on_error: true
	filter_mode: nofilter

	- name: Inform Slack users of check failures
	uses: tiloio/slack-webhook-action@v1.1.2
	if: failure() && github.ref_name == 'main'
	with:
	slack_web_hook_url: ${{ secrets.SLACK_WEBHOOK_BRIMLABS_DOCS }}
	slack_json: \|
	{
	"username": "markdown-lint",
	"text": "Markdown lint check failed: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
	}