Update CORS configuration in main.go

- Updated the handling of the ALLOWED_ORIGINS environment variable to ensure a default value of '*' is used when the variable is empty, improving the flexibility of CORS settings.

main.go

@@ -58,7 +58,11 @@ func main() {
 
 	r := chi.NewRouter()
 
-	allowedOrigins := strings.Split(getEnv("ALLOWED_ORIGINS", "*"), ",")
+	allowedOriginsStr := getEnv("ALLOWED_ORIGINS", "*")
+	if allowedOriginsStr == "" {
+		allowedOriginsStr = "*"
+	}
+	allowedOrigins := strings.Split(allowedOriginsStr, ",")
 	r.Use(cors.Handler(cors.Options{
 		AllowedOrigins:   allowedOrigins,
 		AllowedMethods:   []string{"GET", "POST", "OPTIONS"},