build(node): add KOKORO_BUILD_ARTIFACTS_SUBDIR to env (#482)
build(node): add KOKORO_BUILD_ARTIFACTS_SUBDIR to env (#482)

Source-Author: Benjamin E. Coe <69440dae14aaa9fe2429b324bfce03449d09e1db@google.com>
Source-Date: Mon Nov 2 15:56:09 2020 -0500
Source-Repo: googleapis/synthtool
Source-Sha: ba9918cd22874245b55734f57470c719b577e591
Source-Link: https://github.com/googleapis/synthtool/commit/ba9918cd22874245b55734f57470c719b577e591
googleapis/google-cloud-node,googleapis/google-cloud-node,googleapis/google-cloud-node,googleapis/google-cloud-node