#88 #89 : use pytest + reorganise settings (#92)

- !88 pytest on existing tests
- !89 reorganise settings (! see notes for deployment)

Co-authored-by: bkfox <thomas bkfox net>
Reviewed-on: rc/aircox#92

scripts/cron

@@ -1,4 +1,5 @@
 #! /bin/sh
+export DJANGO_SETTINGS_MODULE=instance.settings.prod
 
 # aircox daily tasks:
 # - diffusions monitoring for the current month