[web-containers] Adds an explicit service in case we want to have two services.

system/features/web-containers.nix

@@ -113,6 +113,7 @@
               {
                 "traefik.enable" = "true";
                 "traefik.http.routers.${serviceName}.rule" = "${routerRule}";
+                "traefik.http.routers.${serviceName}.service" = "${serviceName}";
                 "traefik.http.services.${serviceName}.loadbalancer.server.port" = "${toString port}";
               }
               // oauthLabels