Docker-http not working

I checked this file and it doesn’t work distrobuilder/doc/examples/sabayon.yaml at main · lxc/distrobuilder · GitHub

root@distrobuilder:~/templates# distrobuilder build-incus sabayon.yaml

INFO   [2025-02-28T19:09:59Z] Downloading source                           
2025/02/28 19:09:59 registry.ping url=https://registry-1.docker.io/v2/
2025/02/28 19:10:01 registry.manifest.get url=https://registry-1.docker.io/v2/sabayon/builder-amd64/manifests/latest repository=sabayon/builder-amd64 reference=latest
ERROR 2025/02/28 19:10:02 missing signature key

Did i do something wrong? How to solve this problem? @stgraber

Thanks for any help!