Docker swarm setup W/ secrets and external postgres

Hello :D I agree that supporting existing infrastructure is important for adoption, especially in production environments. Many developers and organizations already have a reverse proxy such as Traefik and an existing database cluster running. Requiring additional services can make evaluation and deployment more complex than necessary. Having dedicated documentation for Docker Swarm deployments, secret management through Swarm Secrets, and integration with external PostgreSQL instances would likely make Fluxer easier to adopt in enterprise environments. Even if these configurations are not the primary deployment path, providing examples and best practices could help users integrate Fluxer into existing infrastructure without duplicating services.