[2.0.x] Add annotation in pipeline runs.

[scottarnette]

Change Description

Adds an annotation to Buildkite pipeline runs that explains what environment variables can be set.

Change Type

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• Documentation

• Stability bug fix

• Other

• Other - special case

Testing Changes

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• New Tests

• Existing Tests

• Test Framework

• CI System

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Consensus Changes

• Consensus Changes

API Changes

• API Changes

Documentation Additions

• Documentation Additions

[kj4ezj]

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