Added docker pipeline for testing

Jenkinsfile

@@ -31,6 +31,15 @@ pipeline {
                 '''
             }
         }
+        stage('Test Docker Pipeline') {
+            steps {
+                script {
+                    docker.image('alpine:3.20').withRun('', 'sleep 5') { container ->
+                        echo "Docker Pipeline started container: ${container.id}"
+                    }
+                }
+            }
+        }
     }
 
     post {