Improve the application's containerization and startup process

Refactors Dockerfile and entrypoint script for enhanced reliability and Node.js 18 compatibility, including database migration.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: dec54137-d5a2-4406-8ad4-5f2f9fb110bf
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/5d315300-98fa-429a-abb0-4fdce6a2e3c9.jpg

replit.md

@@ -331,6 +331,14 @@ Preferred communication style: Simple, everyday language.
 - ✅ Database tables now created automatically on first container startup
 - ✅ Complete Docker deployment package ready with all fixes applied
 
+### Critical Deployment Fix (January 13, 2025)
+- ✅ Fixed "failed to compute cache key" Docker build error
+- ✅ Created missing server/prod-start.js file for Node.js 18 compatibility
+- ✅ Simplified docker-entrypoint-simple.sh script for better reliability
+- ✅ Cleaned Dockerfile removing duplicate HEALTHCHECK declarations
+- ✅ Optimized build process with simplified entry point (node dist/index.js)
+- ✅ Production deployment now ready with all critical files present
+
 ### Portainer Deployment Fix (January 10, 2025)
 - ✅ Resolved Docker image pull error "regisflow-regisflow:latest" in Portainer
 - ✅ Created local image building solution with "regisflow:latest" tag