store built binaries in artifact folder

buildkite/bazelci.py

diff --git a/buildkite/bazelci.py b/buildkite/bazelci.py
index 0a6749f..21a7750 100644
--- a/buildkite/bazelci.py
+++ b/buildkite/bazelci.py
@@ -599,11 +599,11 @@
 
 
 def bazelci_builds_download_url(platform, build_number):
-  return "https://storage.googleapis.com/bazel-builds/{0}/{1}/bazel".format(build_number, platform)
+  return "https://storage.googleapis.com/bazel-builds/artifacts/{0}/{1}/bazel".format(build_number, platform)
 
 
 def bazelci_builds_upload_url(platform, build_number):
-  return "gs://bazel-builds/{0}/{1}/bazel".format(build_number, platform)
+  return "gs://bazel-builds/artifacts/{0}/{1}/bazel".format(build_number, platform)
 
 
 def bazelci_builds_metadata_url(platform):