Adding test Jenkinsfile

Jenkinsfile

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+pipeline {
+
+    agent 'python:3.10-slim-bullseye'
+
+    stages {
+        stage('Setup') {
+            steps {
+                sh 'Hello world!'
+            }
+        }
+        stage('Check') {
+            steps {
+                sh 'Hello galaxy!'
+            }
+        }
+    }
+
+    post {
+        always {
+            cleanWs()
+        }
+    }
+
+}