There is an updated pull request by dkwo against master on the void-packages repository

https://github.com/dkwo/void-packages etck
https://github.com/void-linux/void-packages/pull/42192

etckeeper: update to 1.18.20, support xbps, run tests
- I tested the changes in this PR: yes
- I built this PR locally for my native architecture, (`x86_64-musl`)

A couple of tests fail, likely due to `fakeroot` or similar.

A patch file from https://github.com/void-linux/void-packages/pull/42192.patch is attached