Properly handle rm -rf result on Mac
diff --git a/tools/run_tests/build_artifact_node.sh b/tools/run_tests/build_artifact_node.sh
index 1467ddd..6aa4824 100755
--- a/tools/run_tests/build_artifact_node.sh
+++ b/tools/run_tests/build_artifact_node.sh
@@ -36,7 +36,7 @@
 
 cd $(dirname $0)/../..
 
-rm -rf build
+rm -rf build || true
 
 mkdir -p artifacts