this small change was teached to me on gitlab alpine devs. We need the -a after changing a repo.
Also I "downgraded" to latest-stable because the edge/testing repo is only needed to get the 1.27-r2 working with webvault 2022.12
Created a new `/etc/apk/repositories` that doesn't use a fixed version number for alpine linux. We are able to update the LXC's OS with this instead of just the packages.
I also added the testing repo to the file to be able to update vaultwarden in the future with a simple `apk update && apk upgrade`