99% of Wolfi is the package repository. We've compiled all the software to run an OS from source against glibc and made it available as APKs (apart from the kernel). The major use case for this is composing container images using tools like apko.

When you run Linux containers, you're using the kernel from the host, but everything else is provided in the container i.e. file system, utilities etc. So you can effectively run Debian or Alpine on top of a Arch kernel by just doing "docker run debian" etc. And now you can also do "docker run cgr.dev/chainguard/wolfi-base".