Copy the file .env.local.example to .env.local and fill in the environment variables. Example:
MYSQL_HOST=localhost
MYSQL_DATABASE=notes
MYSQL_USERNAME=username
MYSQL_PASSWORD=password
MYSQL_PORT=3306
NEXT_PUBLIC_API_URL=http://localhost:3000/api
SECRET=1234567890
NEXT_PUBLIC_DEMO_EMAIL=demo@example.com
NEXT_PUBLIC_DEMO_PASSWORD=123QWE,./
npm install
npm run migrate
npm run build
npm run start -- -p [PORT_NUMBER]