update jenkinfile

Jenkinsfile

@@ -47,6 +47,9 @@ pipeline {
 
         stage('Deploy via SSH') {
             steps {
+                script {
+                    env.DEPLOY_BRANCH = env.BRANCH_NAME ?: 'main'
+                }
                 sshagent(credentials: ['deploy-ssh-key']) {
                     sh """
                         ssh -o StrictHostKeyChecking=no ${env.DEPLOY_USER}@${env.DEPLOY_HOST} << 'DEPLOY_EOF'
@@ -56,7 +59,7 @@ pipeline {
                             # Clone or pull the repo (contains docker-compose.yml)
                             if [ -d .git ]; then
                                 git fetch origin
-                                git reset --hard origin/${env.BRANCH_NAME}
+                                git reset --hard origin/${env.DEPLOY_BRANCH}
                             else
                                 git clone ${env.GIT_REPO_URL} .
                             fi