improve jenkinsfile

tests/Jenkinsfile

@@ -28,7 +28,7 @@ def pre_test(){
 pipeline {
   agent none
   environment{
-      BRANCH = 'develop'
+      BRANCH = $branch_name
       WK = '/var/lib/jenkins/workspace/TDinternal'
       WKC= '/var/lib/jenkins/workspace/TDinternal/community'
   }