Jordan/x defang llm warning (#1080)

* warn about x-defang-llm usage in playground

* automatically write port 80 for managed llm service

Author: jordanstephens

src/pkg/cli/compose/fixup.go

@@ -156,6 +156,19 @@ func FixupServices(ctx context.Context, provider client.Provider, project *types
 			}
 		}
 
+		_, llm := svccfg.Extensions["x-defang-llm"]
+		if llm {
+			if _, ok := provider.(*client.PlaygroundProvider); ok {
+				term.Warnf("service %q: managed LLM is not supported in the Playground; consider using BYOC (https://s.defang.io/byoc)", svccfg.Name)
+				delete(svccfg.Extensions, "x-defang-llm")
+			} else {
+				// HACK: we must have at least one host port to get a CNAME for the service
+				var port uint32 = 80
+				term.Debugf("service %q: adding LLM host port %d", svccfg.Name, port)
+				svccfg.Ports = []types.ServicePortConfig{{Target: port, Mode: Mode_HOST, Protocol: Protocol_TCP}}
+			}
+		}
+
 		if !redis && !postgres && isStatefulImage(svccfg.Image) {
 			term.Warnf("service %q: stateful service will lose data on restart; use a managed service instead", svccfg.Name)
 		}