deployment fixes

Dockerfile

@@ -7,15 +7,17 @@ RUN useradd -m -u 1000 user
 # Set the working directory in the container
 WORKDIR /app
 
-# Install PostgreSQL client libraries and development headers
-# Note: You may need to switch back to root temporarily for this step
+# Install system dependencies
 USER root
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
+RUN apt-get update && apt-get install -y \
+    python3-dev \
     libpq-dev \
     gcc \
     && rm -rf /var/lib/apt/lists/*
 
+# Ensure .files directory exists and is writable
+RUN mkdir -p /app/.files && chown -R user:user /app/.files
+
 # Switch back to the non-root user
 USER user
 
@@ -29,4 +31,4 @@ RUN pip install --no-cache-dir -r requirements.txt
 EXPOSE 8080
 
 # Run chainlit when the container launches
-CMD ["python", "-m", "chainlit", "run", "chatxbt-assistant.py", "--host", "0.0.0.0", "--port", "8080"]
+CMD ["python", "-m", "chainlit", "run", "chatxbt-assistant.py", "--host", "0.0.0.0", "--port", "8080"]