github: Add checker for docs links #10


	# Test docs/ links are valid.
	#
	# htmltest https://github.com/wjdp/htmltest-action/
	# hugo https://github.com/peaceiris/actions-hugo
	# upload test results https://github.com/actions/upload-artifact

	name: check-doc-links

	on: pull_request
	jobs:
	htmltest:
	runs-on: ubuntu-latest
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	steps:
	- name: Check out repository
	uses: actions/checkout@v3
	with:
	submodules: recursive # Fetch Hugo themes
	fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod

	- uses: actions/checkout@v4
	with:
	submodules: true # Fetch Hugo themes (true OR recursive)
	fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod

	- name: Set up Hugo
	uses: peaceiris/actions-hugo@v2
	with:
	hugo-version: '0.117.0'
	extended: true

	- name: Build Hugo
	run: hugo -s docs -d $GITHUB_WORKSPACE/dist

	- name: Run htmltest
	uses: wjdp/htmltest-action@master
	with:
	path: dist
	config: docs/.htmltest.yml

	- uses: actions/upload-artifact@v4
	with:
	name: htmltest-output
	path: dist

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