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

Jenkinsfile

// change 'agent' lines as appropriate

pipeline {
  agent none

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

    stage('next stage') {
      agent { dockerfile true }
      steps {
        echo 'next stage here...'
      }
    }

  }
}

Thank you for that @moertel!