{% load wagtailadmin_tags %}
<form action="{{ button.url }}" method="post">
    <input type="hidden" name="user_pk" value="{{ user_pk }}">
    {% csrf_token %}
    <button type="submit" class="{{ button.classname }}" {{ button.base_attrs_string }}>
        {% icon name=button.icon_name %}
        {{ button.label }}
    </button>
</form>