When using registries you cannot lock pack versions

[magec]

Hello!

I am writing a simple tool called nomad-packfile to be able to deploy several packs all at once. The tool reads a yaml file with the desired state and call nomad-pack to synchronize the state with the nomad cluster(s) (strongly inspired by hemlfile).

I would like to be able to pin packs to a given version, but I don't see how can that be done. I see you can use a registry branch, but I don't see how can you refer to a given version (from the metadata) of a pack.

Thanks in advance (and for nomad-pack)