Add loading banner

Author: maggie-lou

app/alert/alert_service.ts

@@ -5,7 +5,7 @@ export type Alert = {
   type: AlertType;
 };
 
-export type AlertType = "error" | "success" | "warning";
+export type AlertType = "error" | "success" | "warning" | "info";
 
 export class AlertService {
   alerts = new Subject<Alert>();
@@ -27,6 +27,10 @@ export class AlertService {
   error(message: string) {
     this.show({ message, type: "error" });
   }
+
+  loading() {
+    this.show({ message: "Loading...", type: "info" });
+  }
 }
 
 export default new AlertService();

enterprise/app/workflows/workflows.tsx

@@ -390,6 +390,7 @@ class RepoItem extends React.Component<RepoItemProps, RepoItemState> {
       useDefaultWorkflowConfig: updated,
     });
 
+    alert_service.loading();
     rpcService.service
       .updateGitHubRepoSettings(request)
       .then(() => {