pipeline {

    agent any

    stages {

        stage("create file") {
            steps {
                touch "testfile.log"
            }
        }

        stage("when file last modified after job") {
            when {
                expression {
                    findFiles(glob: "testfile.log")?.first()?.lastModified >
                        currentBuild.startTimeInMillis
                }
            }
            steps {
                echo "i ran"
            }
        }
    }
}