Use Flask server in development

docker-compose.yml

@@ -13,6 +13,9 @@ services:
       - "5000:5000"
     environment:
       - "POSTGRES_CONNECTION_PARAMETERS=host=db port=5432 user=capsul password=capsul dbname=capsul"
+    # The image uses gunicorn by default, let's override it with Flask's
+    # built-in development server
+    command: ["flask", "run", "-h", "0.0.0.0", "-p", "5000"]
   db:
     image: "postgres:9.6.5"
     volumes: