these 2 derivations will be built:
  /nix/store/s6khw86p6q31gxqzxyr81z32z9b7s5yn-nixos-test-driver-pg_graphql.drv
  /nix/store/56va3vgip6xz37f7f9j1k1rrahwmfq9r-vm-test-run-pg_graphql.drv