fix drone file so it works

.drone.yml

@@ -4,6 +4,7 @@ pipeline:
     environment:
       - POSTGRES_USER=mhackspace
       - USE_DOCKER=yes
+      - DJANGO_SETTINGS_MODULE=config.settings.test
     commands:
       - python manage.py test
 

config/settings/test.py

@@ -60,3 +60,7 @@ TEMPLATES[0]['OPTIONS']['loaders'] = [
         'django.template.loaders.app_directories.Loader',
     ]),
 ]
+
+DATABASES = {
+    'default': {'ENGINE': 'django.db.backends.sqlite3'}
+}