fix lso Docker file

Dockerfile

@@ -2,16 +2,13 @@ FROM python:3.11
 
 ARG ARTIFACT_VERSION
 
+WORKDIR /app
+
 RUN pip install \
     --pre \
     --extra-index-url https://artifactory.software.geant.org/artifactory/api/pypi/geant-swd-pypi/simple \
+    --target /app \
     goat-lso==${ARTIFACT_VERSION}
 
-# NOTE: a real config must be mounted at
-# /etc/lso/config.json when running the container
-RUN mkdir -p /etc/lso
-COPY config.json.example /etc/lso/config.json
 EXPOSE 8000
-
-ENV SETTINGS_FILENAME=/etc/lso/config.json
-CMD ["uvicorn", "lso.app:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["python", "-m",  "uvicorn", "lso.app:app", "--host", "0.0.0.0", "--port", "8000"]