these 3 derivations will be built:
  /nix/store/fjaiwxmjbw4d3wg37dh4q396zdxzfrgz-helium-appimage-0.21.1.1-fhsenv-rootfs.drv
  /nix/store/aibr804xzsiivqkxx276j8hqmvd9k8k2-helium-appimage-0.21.1.1-bwrap.drv
  /nix/store/ka1kzz3y6zkk9n80lzlnh7vs122mn90h-helium-appimage-0.21.1.1.drv