tree c1ba798e82315e8ac9527352a3e9ccd291490d43
parent 34d31132f7c75a02a9162ca992ea8d32d0680b31
author Geoffrey Martin-Noble <gcmn@google.com> 1647644662 -0700
committer GitHub <noreply@github.com> 1647644662 -0700
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Scripts and pipelines for basic orchestration (#8555)

This adds the Buildkite pipelines that will orchestrate everything
we run on pre- and post-submit. So far, it just triggers a placeholder
pipeline that sleeps for 10 seconds, but has everything in place to
trigger real pipelines.

With a successful CLA check, the pipeline looks like:
https://buildkite.com/iree/presubmit/builds/49
![yes_cla](https://user-images.githubusercontent.com/5732088/159095241-f358b65f-7f0e-46f7-9e7a-f6afc844b7ea.png)


With a failing CLA check it looks like:
https://buildkite.com/iree/presubmit/builds/34
![no_cla](https://user-images.githubusercontent.com/5732088/159095099-d47a2e60-0030-4e3e-8407-70f1be5dd9f3.png)
![block_prompt](https://user-images.githubusercontent.com/5732088/159095216-9be231e4-9517-4c91-be4d-8b8dc7d0944e.png)