feat: do not redeploy global service if spec hasn't changed

internal/cli/client/container.go

@@ -47,8 +47,8 @@ func (cli *Client) CreateContainer(
 			api.LabelManaged:     "",
 		},
 	}
-	if spec.Mode == api.ServiceModeGlobal {
-		config.Labels[api.LabelServiceMode] = api.ServiceModeGlobal
+	if spec.Mode != "" {
+		config.Labels[api.LabelServiceMode] = spec.Mode
 	}
 
 	if len(spec.Ports) > 0 {

internal/cli/client/strategy.go

@@ -120,7 +120,10 @@ func reconcileGlobalContainer(
 			continue
 		}
 
-		svcSpec := c.Container.ServiceSpec()
+		svcSpec, err := c.Container.ServiceSpec()
+		if err != nil {
+			return nil, fmt.Errorf("get service spec: %w", err)
+		}
 		if svcSpec.Equals(spec) {
 			// The container is already running with the same spec.
 			upToDate = true