Add definition for folder with report to the Dockerfile

Additional changes:
  * disabled voting for test_reclass_nodes

Change-Id: Ibc69df5fe2a462c476f18da4797794c251ed1914
Related-prod: #PROD-30542(PROD:30542)
diff --git a/Dockerfile b/Dockerfile
index 960ec96..9ec7b4e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,8 @@
 ENV DEBIAN_FRONTEND=noninteractive \
     DEBCONF_NONINTERACTIVE_SEEN=true \
     LANG=C.UTF-8 \
-    LANGUAGE=$LANG
+    LANGUAGE=$LANG \
+    PYTEST_REPORT_DIR=/var/lib/validation_artifacts
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 USER root