title: Electron-Builder include external folder
body: <p>I am building multiple electron apps and have one directory for common pictures and files. I would like to include them when building each app with electron-builder. The <a href="https://www.electron.build/configuration/configuration" rel="nofollow noreferrer">docs</a> recommended -if I understood correctly- adding the path to the build > files key but it doesn't seem to work using this config file:</p>
  
  <pre><code>"build":{
      "files": [
          "**/*",
          "../common/img/*"
      ]
  }
  </code></pre>
  
  <p>My directory structure is as follows:</p>
  
  <pre><code>|git_folder
  |-- electronapp1
  |---- package.json
  |-- electronapp2
  |---- package.json
  |-- common
  |---- img
  |---- js
  |---- css
  </code></pre>
  
  <p>I am trying to access the common directories with i.e. this HTML code <code>&lt;link rel="stylesheet" href="../common/css/master.css"&gt;</code>. It works when starting it with <code>electron .</code> for debugging and developing, but when building with electron-builder, it doesn't seem to pack the common directories and throws "File not found" in the console.</p>