Implemented startup method to save the application context.

main.go

@@ -20,6 +20,12 @@ func NewApp() *App {
 	return &App{}
 }
 
+// startup is called when the app starts. The context is saved
+// so we can call the runtime methods
+func (a *App) startup(ctx context.Context) {
+	a.ctx = ctx
+}
+
 //go:embed frontend
 var assets embed.FS