### Description
Fixes#38676
The Alpine package registry registers for only, so a request returns .
Clients that probe the index with before fetching it (like and other
-based tools) fail outright.
**Fix:** Change to for the APKINDEX.tar.gz route, matching the pattern
already used by the i386 registry a few lines below.
### Related issue
Closes#38676
Co-authored-by: waterWang <waterWang@users.noreply.github.com>