feat: fix thumbnails button

backend/templates/admin/place_tools.html

@@ -0,0 +1,14 @@
+{% extends "admin/change_list.html" %}
+
+{% block object-tools-items %}
+{{ block.super }}
+<li>
+  <form action="{% url 'exec-tool' %}" method="post" autocomplete="off">
+    {% csrf_token %}
+    <select name="action" onchange="this.form.submit()" style="width:3em">
+      <option value="">...</option>
+      <option value="generate-thumbnails">Rebuild Thumbnails</option>
+    </select>
+  </form>
+</li>
+{% endblock %}