http: fix serve http exits directly after starting

cmd/serve/http/http.go

@@ -69,6 +69,7 @@ control the stats printing.
 				return err
 			}
 			s.Bind(router)
+			httplib.Wait()
 			return nil
 		})
 	},

lib/http/http.go

@@ -231,6 +231,11 @@ func (s *server) Serve() {
 	}
 }
 
+// Wait blocks while the server is serving requests
+func (s *server) Wait() {
+	s.closing.Wait()
+}
+
 // Router returns the server base router
 func (s *server) Router() chi.Router {
 	return s.baseRouter
@@ -291,6 +296,11 @@ func Restart() error {
 	return start()
 }
 
+// Wait blocks while the default http server is serving requests
+func Wait() {
+	defaultServer.Wait()
+}
+
 // Start the default server
 func start() error {
 	defaultServerMutex.Lock()