Docker worker enhancement

* drops docker worker process in favor of background celery worker on main process
* changes uploaded files folder into host-based folder

docker-compose.yml

@@ -15,10 +15,11 @@ services:
       - arnova-nginx-server:arnova
     build: .
     container_name: "konova-docker"
-    command: gunicorn konova.wsgi:application --bind 0.0.0.0:8000
+    command: sh -c 'celery -A konova worker -l INFO --detach && gunicorn konova.wsgi:application --bind 0.0.0.0:8000'
+    restart: always
     volumes:
       - .:/konova
-      - konova_uploaded_files:/konova_uploaded_files
+      - /path/to/host/folder:/konova_uploaded_files
       - static_file_volume:/konova/static  # Point to the volume for static files. Shared with nginx service
     expose:
       - 8000
@@ -36,31 +37,6 @@ services:
       - SMTP_PORT=25
       - SMTP_REAL_REPLY_MAIL=ksp-servicestelle@sgdnord.rlp.de
 
-# To provide a celery worker instance, we need to add the celery worker as an own service
-  celery_worker:
-    external_links:
-      - postgis:db
-      - arnova-nginx-server:arnova
-    build: .
-    container_name: "konova-worker-docker"
-    command: celery -A konova worker -l INFO
-    volumes:
-      - .:/konova
-      - konova_uploaded_files:/konova_uploaded_files
-    depends_on:
-      - konova
-    environment:
-      - POSTGRES_NAME=konova
-      - POSTGRES_PORT=5432
-      - POSTGRES_PASSWORD=CHANGE_ME
-      - POSTGRES_USER=konova
-      - POSTGRES_HOST=db
-      - REDIS_HOST=redis
-      - SSO_HOST=CHANGE_ME_TO_SSO_HOST_URL
-      - SMTP_HOST=172.17.0.1
-      - SMTP_PORT=25
-      - SMTP_REAL_REPLY_MAIL=ksp-servicestelle@sgdnord.rlp.de
-
   nginx:
     build: ./nginx
     container_name: "konova-nginx-server"
@@ -79,5 +55,4 @@ networks:
       name: postgis_nat_it_backend
 
 volumes:
-  static_file_volume:
-  konova_uploaded_files:
+  static_file_volume: