bind ssh private key and use it in a jenkinsfile example

jenkinsfile

node('node-label'){
  stage('Deploy') {
    withCredentials([[$class: 'SSHUserPrivateKeyBinding', credentialsId: "1dc9ca1e-a461-40c2-8478-969c66bea0b6", keyFileVariable: 'SSH_PRIVATE_KEY', passphraseVariable: '', usernameVariable: 'SSH_USERNAME']]){
      sh "ssh-agent /bin/bash"

      sh """
          eval \$(ssh-agent) && ssh-add ${SSH_PRIVATE_KEY} && ssh-add -l &&
          ENVIRONMENT=${env.ENVIRONMENT} \
          PLAYBOOK=${env.PLAYBOOK} \
          BASTION_USER=${env.BASTION_USER} \
          BASTION_HOST=${env.BASTION_HOST} \
          ./deploy-ansible.sh
      """
    }
  }
}