Add printing of creating date

Change-Id: Ida3aeb09365c3c368bfd6d48ef458403add1ead1
diff --git a/bin/entrypoint.sh b/bin/entrypoint.sh
index 3c9b695..610c17e 100755
--- a/bin/entrypoint.sh
+++ b/bin/entrypoint.sh
@@ -4,6 +4,7 @@
 
 function _info(){
   echo -e "=== INFO: PIKE"
+  cat /etc/build_timestamp || true
   set +x
   echo -e "=== INFO: tempest version:"
   tempest --version