title: Vue CLI - Environment Specific URL's
body: <p>Working on moving a project to Vue and separating our API from the UI. It's been going well, but the only issue I have is the URL's for the UI won't match the API service so I can't use relative paths, and I'm unsure how to get webpack to switch them out for absolute paths that will match the appropriate service.</p>
  
  <p>Ideally I'd like a webpack.config.js variable that when it packs the js knows to replace something like '%API_URL%' with some value. Is there a way with webpack or the vue CLI to handle this situation?</p>