fix Dockerfile user for HF Spaces

Dockerfile

@@ -1,7 +1,15 @@
 FROM python:3.11-slim
+
+RUN useradd -m -u 1000 user
+USER user
+ENV PATH="/home/user/.local/bin:$PATH"
+
 WORKDIR /app
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
-COPY . .
+
+COPY --chown=user requirements.txt .
+RUN pip install --no-cache-dir --upgrade -r requirements.txt
+
+COPY --chown=user . .
+
 EXPOSE 7860
-CMD uvicorn main:app --host 0.0.0.0 --port 7860
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]