migrate currency.prebid.org to jsdelivr

[bretg]

Type of issue

cost containment

Description

There are a few publishers who have ignored repeated requests to stop using currency.prebid.org/latest.json. Prebid spends a lot of money on AWS CloudFront fees for these holdouts.

What are some ways to reduce our AWS fees? We can't just use DNS because the URL paths are different as well. Perhaps a Lambda function that does a redirect?

currency.prebid.org/latest.json should redirect to https://cdn.jsdelivr.net/gh/prebid/currency-file@1/latest.json