fix pushing to remote repo

Jenkinsfile

@@ -95,7 +95,7 @@ pipeline {
                         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"'
-                        sh 'git push origin HEAD:jenkins-jobs'
+                        sh "git push origin HEAD:${BRANCH_NAME}"
                     }
                 }
             }