docs/svinde: add gainvalley as bad firms #19

	name: Build docs website

	on:
	pull_request:

	jobs:
	build-docs:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	# Cache node modules and next folder
	- name: 📬 Caching
	uses: actions/cache@v4
	with:
	path: \|
	**/node_modules
	key: ${{ runner.os }}-modules-${{ hashFiles('yarn.lock') }}

	- name: Use Node.js LTS
	uses: actions/setup-node@v4
	with:
	node-version-file: package.json

	- name: 🧰 Install dependencies
	run: yarn install

	- name: 📦 Build project
	run: yarn build

	- name: Check formatting
	run: yarn run prettier --check

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