Add missing papperEnv for backupninja pipes

Change-Id: Ie00bb4205af6775f7e347a98a613cd761c7dc8ec
Related: PROD-29677(PROD:29677)
diff --git a/backupninja-backup-pipeline.groovy b/backupninja-backup-pipeline.groovy
index 9370ccf..45812a4 100644
--- a/backupninja-backup-pipeline.groovy
+++ b/backupninja-backup-pipeline.groovy
@@ -1,6 +1,7 @@
 def common = new com.mirantis.mk.Common()
 def salt = new com.mirantis.mk.Salt()
 def python = new com.mirantis.mk.Python()
+def pepperEnv = "pepperEnv"
 
 timeout(time: 12, unit: 'HOURS') {
     node() {