title: Anything like export-add for gitattribute?
body: <p>How can I overwrite an excluded folder in <code>.gitignore</code>, by adding it when I generate my archive with <code>git-archive</code>?</p>
  
  <p>There is <code>export-ignore</code>, but it can't find anything like <code>export-add</code>`export-include`.</p>
  
  <p>Any ideas?</p>