Improve testing the docker container

Have sendfile actually serve files if debug is on, and clean up the dockerfile

docker-compose.yml

@@ -16,14 +16,11 @@ services:
             - postgres
         volumes:
             - ./website:/usr/src/app
-            - /concrexit/
+            - concrexit:/concrexit/
         environment:
             <<: *postgresvars
             DJANGO_DEBUG: 'True'
             DJANGO_POSTGRES_HOST: postgres
-            MIGRATION_KEY: ${CONCREXIT_MIGRATION_KEY}
 volumes:
-    concrexit-media:
-        driver: local
-    concrexit-static:
+    concrexit:
         driver: local

website/thaliawebsite/settings/production.py

@@ -58,7 +58,8 @@ CONN_MAX_AGE = '60'
 MEDIA_ROOT = '/concrexit/media'
 MEDIA_URL = '/media/'  # Public is included by the db fields
 
-SENDFILE_BACKEND = 'sendfile.backends.nginx'
+if not settings.DEBUG:
+    SENDFILE_BACKEND = 'sendfile.backends.nginx'
 SENDFILE_URL = '/media/'
 SENDFILE_ROOT = '/concrexit/media/'