feat: add due date reminders functionality with cron jobs and test scripts

Dockerfile

@@ -40,6 +40,9 @@ RUN npm run build
 COPY docker-entrypoint.sh /docker-entrypoint.sh
 RUN chmod +x /docker-entrypoint.sh
 
+# Make scripts executable
+RUN chmod +x backup-db.mjs send-due-date-reminders.mjs
+
 # Expose the default Next.js port
 EXPOSE 3000