build-package, lint: Add --serial
flag
#556
Merged
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Previously, we had a Buildkite-specific hack to propagate the BUILDKITE environment variable in order to run these commands serially. This is potentially surprising behaviour, particularly if the consumer is propagating the variable for some other purpose.
That point will become less hypothetical once skuba adds built-in support for Buildkite annotations. We replace the inference with a very explicit flag.