Workaround #87

	name: Check that 'next export' works
	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	next-export:
	timeout-minutes: 60
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	with:
	submodules: true
	- uses: actions/cache@v2
	with:
	path: \|
	~/.npm
	${{ github.workspace }}/.next/cache
	# Generate a new cache whenever packages or source files change.
	key: ${{ runner.os }}-nextjs-${{ hashFiles('/package-lock.json') }}-${{ hashFiles('.[jt]s', '**.[jt]sx') }}
	# If source files changed but packages didn't, rebuild from a prior cache.
	restore-keys: \|
	${{ runner.os }}-nextjs-${{ hashFiles('**/package-lock.json') }}-
	- uses: actions/setup-node@v2
	with:
	node-version: '16.x' # Same as in package.json
	- name: Use .env.development
	# NB: copying instead of symlinking due to https://github.com/vercel/next.js/issues/53086
	run: cp .env.development .env
	- name: Install dependencies
	run: npm ci
	- name: Build the app
	run: npm run build
	- name: Run 'next export'
	run: npx next export

Provide feedback