manage: Check Django version on startup

This was recently reported as an issue. Add a simple check to ensure
people update their dependencies as expected.

Signed-off-by: Stephen Finucane <stephen@that.guru>
Cc: Siddhesh Poyarekar <sipoyare@redhat.com>
Cc: DJ Delorie <dj@redhat.com>
Cc: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit b5769e6)

Author: stephenfin

manage.py

@@ -7,6 +7,11 @@
         "DJANGO_SETTINGS_MODULE", "patchwork.settings.production"
     )
 
+    import django
+
+    if django.VERSION < (3, 2):
+        raise Exception('Patchwork requires Django 3.2 or greater')
+
     from django.core.management import execute_from_command_line
 
     execute_from_command_line(sys.argv)

releasenotes/notes/check-django-on-startup-332acc16e7e8be8b.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    The version of Django used is now checked on start-up. This can help avoid
+    issues where deployers forget to update their Django version and see odd
+    behavior as a result.