Jon has as usual done an incredible job of providing a very similar answer to the one Netlify’s staff would have. The “missing piece” is one we’re working on writing up right now - TL;DR we only automatically “forward” environment variables from our UI, NOT from netlify.toml (nor automatically set like “$COMMIT_REF”), to functions. The plugin Jon linked is a good way to get there, or you can manually interpolate the variables as explained in this article:
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