Use lychee link checker #269

	name: markdown
	on:
	pull_request:
	paths:
	- '.github/workflows/markdown.yml'
	- '.github/markdownlint.json'
	- '.github/markdownlint.jsonc'
	- '*/.md'

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
	cancel-in-progress: true

	permissions:
	contents: read

	jobs:
	linter:
	name: Lint markdown files
	runs-on: ubuntu-latest
	steps:
	- name: Harden Runner
	if: ${{ !github.event.repository.private }}
	uses: step-security/harden-runner@a5ad31d6a139d249332a2605b85202e8c0b78450 # v2.19.1
	with:
	egress-policy: audit

	- name: Checkout devtools
	uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

	- name: Register markdownlint warning matcher
	run: \|
	echo "::add-matcher::.github/markdownlint.json"

	- name: Lint markdown files
	uses: avto-dev/markdown-lint@04d43ee9191307b50935a753da3b775ab695eceb # v1.5.0
	with:
	args: '*/.md'
	ignore: '/testinput/'
	config: '.github/markdownlint.jsonc'

	- name: Remove markdownlint warning matcher
	if: always()
	run: \|
	echo "::remove-matcher owner=markdownlint::"

	check-links:
	name: Check markdown links
	runs-on: ubuntu-latest
	steps:
	- name: Checkout devtools
	uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

	- name: Check markdown links
	uses: lycheeverse/lychee-action@8646ba30535128ac92d33dfc9133794bfdd9b411 # v2.8.0
	with:
	args: --config .github/lychee.toml --verbose --no-progress './*/.md'
	fail: true
	jobSummary: true

Provide feedback