Fix the logout to use a POST (introduced with Django 4.1)

Also add an handy command to clear Django cache

ram/portal/templates/includes/login.html

@@ -18,7 +18,12 @@
               <li><a class="dropdown-item" href="{% url 'admin:index' %}">Admin</a></li>
               <li><a class="dropdown-item" href="{% url 'admin:portal_siteconfiguration_changelist' %}">Site configuration</a></li>
               <li><hr class="dropdown-divider"></li>
-              <li><a class="dropdown-item text-danger" href="{% url 'admin:logout' %}?next={{ request.path }}">Logout</a></li>
+              <li>
+                <form id="logout-form" method="post" action="{% url 'admin:logout' %}?next={{ request.path }}">
+                  {% csrf_token %}
+                  <button class="btn btn-link dropdown-item text-danger" type="submit">Log out</button>
+                </form>
+              </li>
             </ul>
             {% else %}
             <a class="nav-link" href="{% url 'admin:login' %}?next={{ request.path }}">Log in</a>

ram/ram/__init__.py

@@ -1,4 +1,4 @@
 from ram.utils import git_suffix
 
-__version__ = "0.13.3"
+__version__ = "0.13.4"
 __version__ += git_suffix(__file__)

ram/ram/management/commands/purge_cache.py

@@ -0,0 +1,13 @@
+from django.core.cache import cache
+from django.core.management.base import BaseCommand, CommandError
+
+
+class Command(BaseCommand):
+    help = "Clear the application cache"
+
+    def handle(self, *args, **options):
+        try:
+            cache.clear()
+            self.stdout.write(self.style.SUCCESS("Cache cleared"))
+        except Exception:
+            raise CommandError("Cache is not active")