Update Jenkinsfile

Jenkinsfile-version-increment/Jenkinsfile

@@ -51,6 +51,9 @@ pipeline {
                 script {
                     withCredentials([usernamePassword(credentialsId: 'gitlab-credentials', passwordVariable: 'PASS', usernameVariable: 'USER')]) {
                         // git config here for the first time run
+                        sh 'git config --global user.email "jenkins@example.com"'
+                        sh 'git config --global user.name "jenkins"'
+
                         sh "git remote set-url origin https://${USER}:${PASS}@gitlab.com/nanuchi/java-maven-app.git"
                         sh 'git add .'
                         sh 'git commit -m "ci: version bump"'