If what you’re after are the git credentials you can use the SSH Agent plugin like in this link: https://issues.jenkins-ci.org/browse/JENKINS-28335?focusedCommentId=260925&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-260925
sshagent(['git-credentials-id']) {
sh "git push origin master"
}