fix(rollback): Use correct container name 'nginx' instead of 'demo-nginx'

apps/demo-nginx/Jenkinsfile.rollback

@@ -34,6 +34,7 @@ pipeline {
     
     environment {
         APP_NAME = 'demo-nginx'
+        CONTAINER_NAME = 'nginx'  // Fixed: actual container name
         NAMESPACE = 'demo-app'
         DOCKER_REGISTRY = 'docker.io'
         DOCKER_REPO = 'vladcrypto'
@@ -77,6 +78,12 @@ pipeline {
                             -o jsonpath='{.spec.template.spec.containers[0].image}'
                         echo ""
                         
+                        echo ""
+                        echo "=== Container Name ==="
+                        kubectl get deployment ${APP_NAME} -n ${NAMESPACE} \
+                            -o jsonpath='{.spec.template.spec.containers[0].name}'
+                        echo ""
+                        
                         echo ""
                         echo "=== Current Pods ==="
                         kubectl get pods -n ${NAMESPACE} -l app=${APP_NAME}
@@ -130,11 +137,11 @@ pipeline {
                     echo "🚀 Executing rollback..."
                     
                     if (params.ROLLBACK_METHOD == 'IMAGE_TAG') {
-                        // Method 1: Update image directly
+                        // Method 1: Update image directly using correct container name
                         sh """
                             echo "Setting image to: ${env.TARGET_IMAGE}"
                             kubectl set image deployment/${APP_NAME} \
-                                ${APP_NAME}=${env.TARGET_IMAGE} \
+                                ${CONTAINER_NAME}=${env.TARGET_IMAGE} \
                                 -n ${NAMESPACE} \
                                 --record
                         """
@@ -271,6 +278,10 @@ pipeline {
                         echo ""
                         echo "=== New Pods ==="
                         kubectl get pods -n ${NAMESPACE} -l app=${APP_NAME}
+                        
+                        echo ""
+                        echo "=== Updated Rollout History ==="
+                        kubectl rollout history deployment/${APP_NAME} -n ${NAMESPACE}
                     """
                 }
             }
@@ -313,6 +324,7 @@ pipeline {
                     ✅ ROLLBACK SUCCESSFUL!
                     
                     Application: ${APP_NAME}
+                    Container: ${CONTAINER_NAME}
                     Method: ${params.ROLLBACK_METHOD}
                     Target: ${params.TARGET_VERSION}
                     Namespace: ${NAMESPACE}
@@ -329,8 +341,11 @@ pipeline {
             
             Please check the logs and try again.
             
-            Manual rollback command:
+            Manual rollback commands:
             kubectl rollout undo deployment/${APP_NAME} -n ${NAMESPACE}
+            
+            Or set image directly:
+            kubectl set image deployment/${APP_NAME} ${CONTAINER_NAME}=<image> -n ${NAMESPACE}
             """
         }
     }