these 4 derivations will be built:
  /nix/store/rly82sfdnlnbgzk19qc5z4nssmml0x9g-herdr-core-0.1.21-vendor.drv
  /nix/store/yf72qi5i9769b4qq5w7idwxrg0gbm341-herdr-core-0.1.21.drv
  /nix/store/05kq8hgdminbn90163qsqb0dhj1qy39p-herdr-app-0.1.14.drv
  /nix/store/49kg3pxkgwhrjhjpdc65r3xz8zb33fzz-check-herdr-app.drv