Simplify: use SCM checkout, remove manual clone

Jenkinsfile

@@ -3,19 +3,9 @@ pipeline {
 
     environment {
         CLOUDFLARE_API_TOKEN = 'cfut_cYi1Do6CdWPGD8ecrJ6ZtnOMcjU2GI6LdEToDEct71ff4034'
-        GITEA_REPO = 'https://gitea.wufangzhen.com/wfz/home.git'
     }
 
     stages {
-        stage('Checkout') {
-            steps {
-                echo 'Checkout code from Gitea...'
-                sh 'rm -rf *'
-                sh 'git clone ${GITEA_REPO} .'
-                sh 'git checkout ${BRANCH_NAME}'
-            }
-        }
-
         stage('Install') {
             steps {
                 echo 'Installing dependencies...'