New comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/issues/36928#issuecomment-1114107522

Comment:
```
$ docker run -ti alpine apk add --update shadow
Unable to find image 'alpine:latest' locally
latest: Pulling from library/alpine
df9b9388f04a: Pull complete 
Digest: sha256:4edbd2beb5f78b1014028f4fbb99f3237d9561100b6881aabbf5acce2c4f9454
Status: Downloaded newer image for alpine:latest
fetch https://dl-cdn.alpinelinux.org/alpine/v3.15/main/x86_64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/v3.15/community/x86_64/APKINDEX.tar.gz
(1/2) Installing linux-pam (1.5.2-r0)
(2/2) Installing shadow (4.8.1-r1)
Executing busybox-1.34.1-r5.trigger
OK: 8 MiB in 16 packages
```
works fine for me here. have you rebooted since setting up docker?