feat: add yaml env variable reference resolver to config loader #31
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A common usage pattern for
.yaml
config files involve referencing OS environment variables. This PR introduces support for this use case.The current state of the config loader interprets the environment variable reference (e.g
${OPENROUTER_API_KEY}
) as the literal string representation"${OPENROUTER_API_KEY}"
due toviper's
lack of support for this resolution.This change also increases scope for supporting other API keys better (e.g
${ANTHROPIC_API_KEY}
) in the future.