Update lvm-extend.md (#1079) #1393

	name: Check files
	on:
	pull_request:
	types:
	- opened
	- synchronize
	push:
	jobs:
	check:
	runs-on: ubuntu-latest
	steps:
	- name: Check out source files
	uses: actions/checkout@v3

	- name: Get a list of changed files
	uses: jitterbit/get-changed-files@v1
	continue-on-error: true
	id: changed_files

	- name: Filter changed files by extension
	run: \|
	EXTENSIONS="md"
	PATH_PREFIX="source"
	for FILE in ${{ steps.changed_files.outputs.all }}; do
	if [[ $FILE = $PATH_PREFIX* ]]; then
	for EXT in $EXTENSIONS; do
	if [[ ${FILE##*.} == $EXT ]]; then
	SCAN_FILES="$SCAN_FILES $FILE"; continue
	fi
	done
	fi
	done
	echo "scan_files=$SCAN_FILES" >> $GITHUB_ENV

	- name: Run initial tests
	run: ./tests.sh ${{ steps.changed_files.outputs.all }}

	- name: Check files using markdownlint
	uses: actionshub/markdownlint@main
	with:
	path: source

	- name: Spellcheck
	if: env.scan_files != ''
	uses: rojopolis/[email protected]
	with:
	task_name: Markdown
	source_files: ${{ env.scan_files }}

	- name: Render docs to HTML
	uses: ammaraskar/sphinx-action@master
	with:
	pre-build-command: python -m pip install recommonmark
	docs-folder: "source/"
	build-command: "sphinx-build -n -d build/doctrees . build/html"

	- name: Add in compiled CSS and Javascript
	run: \|
	make build/html/_static/css/app.css
	make build/html/_static/app.js

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