Add CORS support and default artifact root to MLflow server command

Dockerfile

@@ -46,6 +46,7 @@ RUN pip install -r /requirements.txt
 # type of server
 CMD mlflow server -p $PORT \
     --host 0.0.0.0 \
+    --allowed-hosts "*" \
     --backend-store-uri $BACKEND_STORE_URI \
     --default-artifact-root $ARTIFACT_STORE_URI \
     --cors-allowed-origins "*"