fix: start one ingress server per controller (#1655)

Fixes #1643

This change will increment the port for each `ingress` and `controller`
being created. One ingress server per controller. The result would look
something like this (keeping the `8892` and `8891` ports respectively)

```bash
info: Starting FTL with 5 controller(s)
info:controller2: Web console available at: http://localhost:8896
info:controller4: Web console available at: http://localhost:8900
info:controller0: Web console available at: http://localhost:8892
info:controller3: Web console available at: http://localhost:8898
info:controller1: Web console available at: http://localhost:8894
info:controller4: HTTP ingress server listening on: http://localhost:8899
info:controller2: HTTP ingress server listening on: http://localhost:8895
info:controller0: HTTP ingress server listening on: http://localhost:8891
info:controller3: HTTP ingress server listening on: http://localhost:8897
info:controller1: HTTP ingress server listening on: http://localhost:8893
```

cmd/ftl/cmd_serve.go

@@ -84,13 +84,15 @@ func (s *serveCmd) Run(ctx context.Context) error {
 
 	wg, ctx := errgroup.WithContext(ctx)
 
-	bindAllocator, err := bind.NewBindAllocator(s.Bind)
+	bindAllocator, err := bind.NewBindAllocator(s.IngressBind)
 	if err != nil {
 		return err
 	}
 
 	controllerAddresses := make([]*url.URL, 0, s.Controllers)
+	ingressAddresses := make([]*url.URL, 0, s.Controllers)
 	for range s.Controllers {
+		ingressAddresses = append(ingressAddresses, bindAllocator.Next())
 		controllerAddresses = append(controllerAddresses, bindAllocator.Next())
 	}
 
@@ -102,7 +104,7 @@ func (s *serveCmd) Run(ctx context.Context) error {
 		config := controller.Config{
 			CommonConfig: s.CommonConfig,
 			Bind:         controllerAddresses[i],
-			IngressBind:  s.IngressBind,
+			IngressBind:  ingressAddresses[i],
 			Key:          model.NewLocalControllerKey(i),
 			DSN:          dsn,
 		}