Update Dockerfile

Dockerfile

@@ -33,6 +33,9 @@ RUN useradd -m flaskuser
 # Copy application code
 COPY . /app
 
+# Create 'letterhead' directory and set write permissions for flaskuser
+RUN mkdir /app/letterhead && chown flaskuser:flaskuser /app/letterhead && chmod 755 /app/letterhead
+
 # Change ownership of /app to flaskuser
 RUN chown -R flaskuser:flaskuser /app
 
@@ -43,4 +46,4 @@ USER flaskuser
 EXPOSE 7860
 
 # Run the Flask app using gunicorn with an infinite request timeout
-CMD ["gunicorn", "--bind", "0.0.0.0:7860", "--timeout", "0", "--access-logfile", "-", "--error-logfile", "-", "app:app"]
+CMD ["gunicorn", "--bind", "0.0.0.0:7860", "--timeout", "0", "--access-logfile", "-", "--error-logfile", "-", "app:app"]