made contructor protected instead of final / private

Author: JensMyParcel

src/main/java/com/example/devopstraining/DevopsTrainingApplication.java

@@ -4,10 +4,10 @@
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
-public final class DevopsTrainingApplication {
+public class DevopsTrainingApplication {
 
-    private DevopsTrainingApplication() {
-        // Private constructor to prevent instantiation
+    protected DevopsTrainingApplication() {
+        // Protected constructor to satisfy Checkstyle while allowing Spring to instantiate
     }
 
     public static void main(final String[] args) {