There's a temporal workaround in scripts/patchtest for the setting the guest machine LOCALE (en_US.UTF-8). We must provide an adequate solution for it.
The patchtest initscript and the core-image-patchtest recipe were refactor, thus this workaround is now inside core-image-patchtest.bb. Due to time constraints and as it is not an urgent matter, I'm moving it to Future. https://git.yoctoproject.org/cgit/cgit.cgi/patchtest/commit/?id=496c48d5cbf09ed5006acf3786c153a8e8ed19a5
This is no longer relevant with the recent Patchtest refactor. The only purpose of the image is to run the patchtest suite against patch files - everything else is done outside the image. Marking as obsolete.