<CI>build TDengine 3.0

Jenkinsfile

@@ -76,36 +76,7 @@ def pre_test(){
     git fetch origin +refs/pull/${CHANGE_ID}/merge
     git checkout -qf FETCH_HEAD
     git clean -dfx
-    '''
-    script {
-      if (env.CHANGE_TARGET == 'master') {
-        sh '''
-        cd ${WK}
-        git checkout master
-        '''
-        }
-      else if(env.CHANGE_TARGET == '2.0'){
-        sh '''
-        cd ${WK}
-        git checkout 2.0
-        '''
-      } 
-      else if(env.CHANGE_TARGET == '3.0'){
-        sh '''
-        cd ${WK}
-        git checkout 3.0
-        '''
-      } 
-      else{
-        sh '''
-        cd ${WK}
-        git checkout develop
-        '''
-      } 
-    }
-    sh '''
-    cd ${WK}
-    git pull >/dev/null 
+    
     git clean -dfx
     export TZ=Asia/Harbin
     date
@@ -124,7 +95,7 @@ pipeline {
   options { skipDefaultCheckout() } 
   environment{
       WK = '/var/lib/jenkins/workspace/TDinternal'
-      WKC= '/var/lib/jenkins/workspace/TDinternal/community'
+      WKC= '/var/lib/jenkins/workspace/TDengine'
   }
   stages {
       stage('pre_build'){