main/alpine-baselayout: fix group of /etc/shadow-
I had cases where /etc/shadow- didn't have the correct group while creating rootfs. I am not 100% sure what caused it but this should fix it.
We are currently working on getting Alpine Linux 3.21 out. This means that merge requests that are not aimed to help with that (only affecting testing, new aports) have a lower priority at the moment. Please be patient, they will be eventually picked up.
I had cases where /etc/shadow- didn't have the correct group while creating rootfs. I am not 100% sure what caused it but this should fix it.