Many services, one cloudflared

What this post added

This post introduces a major enhancement to Argo Tunnel by enabling a single instance of `cloudflared` to proxy an unlimited number of services. This is achieved through the introduction of 'Named Tunnels' and a new 'ingress rules' configuration system. These features allow users to define how traffic is routed from the Cloudflare edge to specific local services based on hostname and path, significantly reducing resource consumption and management overhead for customers with large deployments. It also introduces validation tools for ingress rules and per-rule configuration options for origin requests.