Docker user fix

backend/Dockerfile

@@ -1,10 +1,16 @@
 FROM python:3.11-slim
 
+# Install gosu for privilege dropping
+RUN apt-get update && apt-get install -y --no-install-recommends gosu && rm -rf /var/lib/apt/lists/*
+
 WORKDIR /app
 
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
 COPY . .
+COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh
 
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]