Add Vale testing workflow for pull requests #1778

	name: Remark-lint

	env:
	REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}

	permissions:
	contents: read
	pull-requests: write

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	remark-lint:
	name: runner / remark-lint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v7

	- name: Install pnpm
	uses: pnpm/action-setup@v6
	with:
	# Pinned below 11.12.0, whose self-install crashes with
	# "Cannot use 'in' operator to search for 'integrity' in undefined".
	# https://github.com/pnpm/action-setup/issues/276
	# https://github.com/pnpm/pnpm/issues/12959
	version: 11.11.0

	# npm (not pnpm) is intentional: remark-cli is installed globally by the
	# action at /usr/local/lib/node_modules/. pnpm's global store is not on
	# that resolution path, so remark-cli would fall back to resolving
	# remark-mdx from the project's node_modules, where @mdx-js/react pulls
	# in mdast-util-mdx-jsx@3 — incompatible with remark-cli@10's bundled
	# unified v10 stack. npm -g puts remark-mdx@2 next to remark-cli so the
	# versions stay compatible. install_deps: false prevents the action from
	# running npm install and reintroducing the incompatible project deps.
	- name: Install remark-mdx globally
	run: npm install -g remark-mdx@2

	- name: remark-lint
	uses: reviewdog/action-remark-lint@v5
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	reporter: github-pr-review
	fail_level: "warning"
	level: "warning"
	install_deps: false
	remark_args: "--use=remark-preset-lint-recommended --use=remark-mdx --ext .md,.mdx"

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