If you are pushing nix-snapshotter images to a Docker Registry, then it can only either use what's in your host nix store, or fetch from a binary cache.

The same is true if you are using the special image reference like `nix:0/nix/store/f8b1hia3hcqwa5d46anzy3cszi3s6ybk-nix-image-redis.tar`, it just means that instead of fetching the image manifest from a Registry, you are using the Nix protocols.

You will only build from source dynamically (and a mix of caching) if you are doing `kubectl apply -f ${podSpec}` as a full deployment Nix expression. See the README's asciinema and this file as an example: https://github.com/pdtpartners/nix-snapshotter/blob/v0.1.0/e...