implement support for OCI registries
With projects such as ORAS (OCI Registry as Storage), it may be interesting to support fetching apk packages as if they were objects stored in OCI registries. This would allow users to distribute apk packages at zero cost by using pre-existing OCI registries such as DockerHub, GHCR, etc.
Other package managers, such as Homebrew, have implemented support for this distribution method. I believe OpenWrt developers have expressed interest in this as well.
(This would be for something after apk 3.0 release.)