fix: Update Dockerfile to address security issues

services/content-service/Dockerfile

@@ -1,6 +1,9 @@
 # Base image
 FROM python:3.10
 
+# Create a non-root user and set permissions
+RUN useradd -m appuser
+
 # Set the working directory
 WORKDIR /app
 
@@ -16,5 +19,8 @@ COPY alembic.ini .
 # Expose the port for content-service (8000)
 EXPOSE 8000
 
+# Switch to the non-root user
+USER appuser
+
 # Run the app using uvicorn
 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]