Bump express from 4.19.2 to 4.21.0 #13

	name: Build Check

	on:
	push:
	branches:
	- master
	pull_request:
	branches:
	- master

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Set up Node.js
	uses: actions/setup-node@v4
	with:
	node-version: '18'
	cache: 'npm'

	- name: Install dependencies
	run: npm ci

	- name: Run build
	run: npm run build

	- name: Check for production build
	run: test -f build/index.html

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