latest image has only arch arm64

[waja]

Summary

⠦ Image ghcr.io/nfrastack/container-db-backup Pulling
no matching manifest for linux/amd64 in the manifest list entries

see https://github.com/nfrastack/container-db-backup/pkgs/container/container-db-backup/1083121419?tag=latest

[pjv]

amd64 build in the latest action failed:

https://github.com/nfrastack/container-db-backup/actions/runs/30567443240/job/90955585796