Add E2E tests for Slovak National Council voting calculator #1498

	name: "Frontend: build, test & lint"
	on:
	push:
	branches: main
	paths:
	- frontend/**
	pull_request:
	paths:
	- frontend/**
	jobs:
	build:
	name: Build, test & lint
	runs-on: ubuntu-latest
	defaults:
	run:
	working-directory: frontend
	steps:
	- name: Checkout repository
	uses: actions/checkout@v3
	- name: Setup Node.js
	uses: actions/setup-node@v3
	with:
	node-version-file: ./frontend/.nvmrc
	- name: Get NPM cache folder path
	id: npm-cache-folder
	run: \|
	echo "path=$(npm config get cache)" >> $GITHUB_OUTPUT
	- name: Set up NPM cache
	uses: actions/cache@v3
	id: npm-cache
	env:
	cache-name: frontend-node-modules
	with:
	path: ${{ steps.npm-cache-folder.outputs.path }}
	key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
	restore-keys: \|
	${{ runner.os }}-${{ env.cache-name }}-
	- name: Install dependencies
	run: \|
	npm ci
	- name: Lint
	run: \|
	npm run lint
	- name: Check formatting
	run: \|
	npx prettier --check .
	- name: Build
	run: \|
	npm run build
	- name: Run unit tests
	run: \|
	npm run test:unit
	- if: false
	name: Run end-to-end tests
	run: \|
	npm run test:e2e:ci

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