fixing file permissions via dockerfile

Dockerfile

@@ -6,6 +6,8 @@ ENV HOME=/home/user \
 WORKDIR $HOME/app
 COPY --chown=user . $HOME/app
 COPY ./requirements.txt ~/app/requirements.txt
+RUN pip install --upgrade pip
 RUN pip install -r requirements.txt
+RUN mkdir -p $HOME/app/data/vectorstore && chown -R user:user $HOME/app/data
 COPY . .
 CMD ["chainlit", "run", "app.py", "--port", "7860"]