We publish some artifacts from this repository, which are specific to
an OS. In the past, we only had a single Linux leg and so we did not
need any additional conditional logic.
However, we now have multiple Linux legs (across different node
versions) running in parallel, so if we try to publish the same
artifacts at the same time, we can run into issues because two `aws s3
cp` jobs try to write to the same file at the same time.
Follow similar logic to our skips we do around publishing NPM and PyPI
packages here, as well.
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