When `nixpkgs.hostPlatform` != `nixpkgs.buildPlatform`, building the top-level attribute fails since the bootspec portion of the system builder tries to reference the host platform's `jq`. Change this to reference the build platform's `jq`.
When `nixpkgs.hostPlatform` != `nixpkgs.buildPlatform`, building the top-level attribute fails since the bootspec portion of the system builder tries to reference the host platform's `jq`. Change this to reference the build platform's `jq`.