These are the stage 2 (isolated glibc environment) packages for Wolfi. They are meant to be used standalone (without Alpine) to bootstrap stage 3.
The package repository is automatically built using GitHub Actions.
It is possible to build the bootstrap packages locally. Assuming that
you have melange already built and its prerequisites installed, then
you can just do:
$ doas make MELANGE_DIR=../path/to/melange/sources
...After a while, you will have a built stage2 toolchain package set, signed
with a local signing key (local-melange.rsa.pub).
This can then be used to build the stage3 packages.