Fix for running webserver

docker/docker-compose.dev.yml

@@ -19,7 +19,7 @@ services:
             context: .
             target: dev
         ports:
-            - 8000
+            - 8000:8000
         volumes:
             # Ensure you specify the location of the 'src' directory at the end of this file
             - src:/home/inventree/src

docker/start_dev_server.sh

@@ -45,4 +45,4 @@ python manage.py migrate --run-syncdb || exit 1
 python manage.py clearsessions || exit 1
 
 # Launch a development server
-python manage.py runserver 0.0.0.0:$INVENTREE_WEB_PORT
+python manage.py runserver 0.0.0.0:$INVENTREE_WEB_PORT