Use production config, and resolve issue with postgres url format (Unsure why this only surfaced after recreation of app)

Dockerfile

@@ -43,5 +43,9 @@ COPY --from=tailwind-builder /app/app/static/css/tailwind.css ./app/static/css/t
 # Expose the port Flask will run on
 EXPOSE 5000
 
+# Set environment variables
+ENV FLASK_ENV=production
+ENV FLASK_CONFIG=ProductionConfig
+
 # Command to run the Flask app
 CMD ["gunicorn", "-b", "0.0.0.0:5000", "app:create_app()"]