quay/static/directives/config/config-string-list-field.html

<div class="config-string-list-field-element">
  <form name="fieldform" novalidate>
    <input type="text" class="form-control" placeholder="{{ placeholder || '' }}"
           ng-model="internalBinding" ng-trim="true" ng-minlength="1" ng-required="!isOptional">
  </form>
</div>