Hi.
I have tried a few upgrades in a row, from 3.13 to 3.14, 3.14 to 3.15, etc ; using the nl mirror. In several instances, a few packages (zlib, alpine-base, zlib-dev) were unavailable (`ERROR: [...]: package mentioned in index not found (try 'apk update')`).
Using dl-cdn instead "fixed" the problem, but I thought I'd report.
Cheers.