Update Dockerfile

Dockerfile

@@ -1,6 +1,6 @@
 FROM python:3.10-slim
 
-# Install wkhtmltopdf and dependencies
+# Install wkhtmltopdf and dependencies, including certificates and a virtual display
 RUN apt-get update && apt-get install -y \
     wkhtmltopdf \
     ca-certificates \
@@ -16,4 +16,5 @@ COPY . .
 RUN mkdir -p /app/temp && chmod -R 777 /app/temp
 
 ENV PORT=7860
-CMD ["python", "app.py"]
+# Run the app inside the virtual display
+CMD ["xvfb-run", "python", "app.py"]