portainer/partials/builder.html

<script src="/lib/ace-builds/src-noconflict/ace.js" type="text/javascript" charset="utf-8"></script>
<h2>Build image:</h2>

<div class="detail">
    <div id="response" class="alert alert-{{ alertClass }}">
        {{ response }}
    </div>

    <div id="editor">

    </div>

    <script>
        ace.config.set('basePath', '/lib/ace-builds/src-noconflict/');

        var editor = ace.edit("editor");
        editor.setTheme("ace/theme/clouds");
        editor.getSession().setMode("ace/mode/batchfile");
    </script>
</div>