fix for env variable

Author: vlad-dargel

tests/e2e/.env

@@ -5,4 +5,4 @@ NOTIFICATION_UPDATE_URL=https://s3.amazonaws.com/redisinsight.test/public/tests/
 NOTIFICATION_SYNC_INTERVAL=30000
 RI_FEATURES_CONFIG_URL=http://static-server:5551/remote/features-config.json
 RI_FEATURES_CONFIG_SYNC_INTERVAL=50000
-RI_ENCRYPTION_KEY=process.env.E2E_RI_ENCRYPTION_KEY
+RI_ENCRYPTION_KEY=$E2E_RI_ENCRYPTION_KEY