Test again with hopefully the correct syntax

Jenkinsfile

@@ -1,6 +1,8 @@
 pipeline {
-    agent {
-        node {
+    agent any
+    stages {
+        stage('Execute playbook') {
+            steps {
                 ansiblePlaybook(
                     playbook: 'main.yaml',
                     credentialsId: 'onedrop-vetinari'
@@ -8,3 +10,4 @@ pipeline {
             }
         }
     }
+}