these 3 derivations will be built:
  /nix/store/r7ahri7c6jsdn2hqy9wqgq4gdw18nhwr-nixos-vm.drv
  /nix/store/kcs77drj04fcjsx31vcna8gwqylf23xg-nixos-test-driver-pgsodium.drv
  /nix/store/c229rybiy4b358dzb586hc7v94730cd8-vm-test-run-pgsodium.drv