Add Kiln Builder Relay Config

[avalonche]

Fixes | Closes | Resolves #

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Changes:

• Add config for boost-builder integration

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
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• Refactoring (no functional changes, no api changes)
• Build related changes
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