title: Vue.js build with different environment variables
body: <p>I've used <a href="https://github.com/vuejs-templates/webpack" rel="noreferrer">official Webpack template</a> for Vue.js. It uses separate configuration for different <a href="http://vuejs-templates.github.io/webpack/env.html" rel="noreferrer">environments</a>. They offer test, development and production. However, I need another one as we have two production servers (one production and one staging).</p>
  
  <p>What is the best practice to have different configurations for different production environments? I would think of something like <code>npm run build --URL:http://some-url.com --PORT:80 ...</code>.</p>
  
  <p>Any advice is welcome!</p>