Test

Bump postcss, postcss-custom-media, stylelint and stylelint-config-sa… #1642

	name: Test
	on: [push, pull_request]
	jobs:
	test:
	name: Test
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- uses: actions/setup-node@v3
	with:
	node-version-file: .nvmrc

	- uses: actions/cache@v2
	with:
	path: ~/.npm
	key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
	restore-keys: \|
	${{ runner.os }}-node-

	- name: Install dependencies
	run: npm install

	# This has to come before linting because we need to run the Gatsby build
	# at least once in order to generate the GraphQL TypeScript definitions.
	# The TypeScript type check lint check will otherwise fail.
	- name: Check build
	run: npm run build

	- name: Run lint checks
	run: npm run lint

	- name: Run tests
	run: npm run test

	- name: Check build-storybook
	run: npm run build-storybook

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