fix jenkinsfile structure, add retry(5) to checkout

platform/Jenkinsfile

@@ -11,7 +11,8 @@ pipeline {
         skipDefaultCheckout()
     }
 
-   stage('Checkout') {
+    stages {
+        stage('Checkout') {
             steps {
                 retry(5) {
                     checkout([
@@ -91,7 +92,7 @@ pipeline {
             echo '✅ Pipeline succeeded — build + Sonar passed, deployed to k8s'
         }
         failure {
-            echo '❌ Pipeline failed  check logs'
+            echo '❌ Pipeline failed — check logs'
         }
     }
 }