Jenkins [skip ci] implementation for multi-branch declarative pipeline

Jenkinsfile

pipeline {
  ...
  
  stages {
    stage('Run CI?') {
      steps {
        script {
          if (sh(script: "git log -1 --pretty=%B | grep -F -ie '[skip ci]' -e '[ci skip]'", returnStatus: true) == 0) {
            currentBuild.result = 'NOT_BUILT'
            error 'Aborting because commit message contains [skip ci]'
          }
        }
      }
    }
  }

  ...
}