Declarative jobsets were broken by the Nix update, causing nix cat-file to break silently.
This commit restores declarative jobsets, based on top of a commit making it easier to see what broke.
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return grab(cmd => ["nix", "cat-store", "--store", getStoreUri(), "$path"]);
return grab(cmd => ["nix", "--experimental-features", "nix-command", "cat-store", "--store", getStoreUri(), "$path"]);
return grab(cmd => ["nix", "--experimental-features", "nix-command",
"cat-store", "--store", getStoreUri(), "$path"]);