title: Maven: add non-JAR dependency
body: <p>I'am using the <code>maven-assembly-plugin</code> to create a <code>tar.gz</code> archive. Now I need to include files in that archive. These are just a bunch of plain old text files and are a dependency at runtime, not at compile or (unit) test time.</p>
  
  <p>I thought about adding a maven dependency on that but these files are not stored in a maven repository but in a simple remove folder. To make it even worse, this folder is password protected. I could, in a pre-build-step, download these password-protected files into a local folder. But then there is still the problem of using those files in the assembly. Also, this is extra work I want to avoid.</p>
  
  <p>Is there any way to do that?</p>