portainer/partials/builder.html

<div id="build-modal" class="modal hide fade">
  <div class="modal-header">
    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
    <h3>Build Image</h3>
  </div>
  <div class="modal-body">
    <div id="editor"></div>
    <p>{{ messages }}</p>
  </div>
  <div class="modal-footer">
    <a href="" class="btn btn-primary" ng-click="build()">Build</a>
  </div>
</div>
<script type="text/javascript">
    var editor = ace.edit("editor");

    editor.setValue('');
    editor.setTheme("ace/theme/clouds");
    editor.getSession().setMode("ace/mode/batchfile");
</script>