Add volatile for roles

Author: Haarolean

api/src/main/java/io/kafbat/ui/config/auth/RoleBasedAccessControlProperties.java

@@ -4,22 +4,20 @@
 import jakarta.annotation.PostConstruct;
 import java.util.ArrayList;
 import java.util.List;
+import lombok.Getter;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 
+@Getter
 @ConfigurationProperties("rbac")
 public class RoleBasedAccessControlProperties {
 
-  private List<Role> roles = new ArrayList<>();
+  private volatile List<Role> roles = new ArrayList<>();
 
   @PostConstruct
   public void init() {
     roles.forEach(Role::validate);
   }
 
-  public List<Role> getRoles() {
-    return roles;
-  }
-
   public void setRoles(List<Role> roles) {
     this.roles = roles;
     init();