Display JOVIAN_WEB_PREPROD_PATH in the env var list

undeployed/ci/jenkinsfile

@@ -22,6 +22,7 @@ pipeline {
                 echo "BUILD_URL : ${env.BUILD_URL}"
                 echo "JOB_URL : ${env.JOB_URL}"
                 echo "JOVIAN_WEB_DEPLOY_PATH : ${env.JOVIAN_WEB_DEPLOY_PATH}"
+                echo "JOVIAN_WEB_PREPROD_PATH : ${env.JOVIAN_WEB_PREPROD_PATH}"
                 echo "Done."
             }
         }