Librem5 images fail to build
This should be easy to fix, but I need to go again.
See https://build.postmarketos.org/#failed, e.g. https://builds.sr.ht/~postmarketos/job/462281#task-img:
(164/586) Installing device-purism-librem5 (1.17-r0)
Executing device-purism-librem5-1.17-r0.post-install
* service gpsd added to runlevel default
* rc-update: service `librem5-shipmode' does not exist
ERROR: device-purism-librem5-1.17-r0.post-install: script exited with error 1