Add optional step of preparing ansible server

Jenkinsfile

@@ -30,6 +30,7 @@ pipeline {
                     withCredentials([sshUserPrivateKey(credentialsId: 'ansible-server-key', keyFileVariable: 'keyfile', usernameVariable: 'user')]){
                         remote.user = user
                         remote.identityFile = keyfile
+                        sshScript remote: remote, script: "prepare-ansible-server.sh"
                         sshCommand remote: remote, command: "ansible-playbook my-playbook.yaml"
                     }
                 }