feat: changeform outer form templates (#891)

Author: lukasvinclav

src/unfold/admin.py

@@ -240,6 +240,8 @@ class ModelAdmin(ModelAdminMixin, BaseModelAdmin):
     list_after_template = None
     change_form_before_template = None
     change_form_after_template = None
+    change_form_outer_before_template = None
+    change_form_outer_after_template = None
     compressed_fields = False
     readonly_preprocess_fields = {}
     warn_unsaved_form = False

src/unfold/templates/admin/change_form.html

@@ -61,6 +61,10 @@
     <div id="content-main">
         {% block form_before %}{% endblock %}
 
+        {% if adminform.model_admin.change_form_outer_before_template %}
+            {% include adminform.model_admin.change_form_outer_before_template %}
+        {% endif %}
+
         <form {% if has_file_field %}enctype="multipart/form-data" {% endif %}{% if form_url %}action="{{ form_url }}" {% endif %}method="post" id="{{ opts.model_name }}_form" {% if adminform.model_admin.warn_unsaved_form %}class="warn-unsaved-form"{% endif %} novalidate>
             {% csrf_token %}
 
@@ -116,6 +120,10 @@
             </div>
         </form>
 
+        {% if adminform.model_admin.change_form_outer_after_template %}
+            {% include adminform.model_admin.change_form_outer_after_template %}
+        {% endif %}
+
         {% block form_after %}{% endblock %}
     </div>
 {% endblock %}