quay/config_app/js/config-field-templates/config-variable-field.html

<div class="config-variable-field-element">
  <div class="btn-group">    
    <button type="button" class="btn btn-default"
            ng-repeat="section in sections"
            ng-click="setSection(section)"
            ng-class="section == currentSection ? 'active' : ''">{{ section.title }}</button>
  </div>

  <span ng-transclude></span>
</div>