How to restrict the users that can run jenkinsfile tests in pull requests?

please try adding these lines in your pipeline script:

node('slaveName') {    properties([            parameters([                    string(                            defaultValue: 'whitelisted1@gmail.com,whitelisted2@gmail.com',                            description: 'comma separated whitelisted emails',                            name: 'WHITELIST'                    )            ])    ])    def authorEmail        stage('Git') {            authorEmail = sh([                    // git log format docs here: https://git-scm.com/docs/pretty-formats                    script      : "git log -1 --format='%aE'",                    returnStdout: true            ]).trim()            boolean allowRun = isWhitelisted(env.WHITELIST, authorEmail)            if (allowRun) {                echo "email ${authorEmail} is whitelisted, proceed execution"            } else {                echo "email ${authorEmail} is not in whitelist ${env.WHITELIST}, proceed jenkins job?"                input message: 'Proceed?'                // or just abort build with non-zero shell exit                // currentBuild.result = 'FAILURE'                // sh "exit 10"            }        }    }}@NonCPSboolean isWhitelisted(whitelist, email) {    def res = whitelist.tokenize(" ,;").find { white -> white == email }    return null != res}