these 2 derivations will be built:
  /nix/store/0vgp99hflzplj5hb4m8v7jz09z9avv4i-nixos-test-driver-pg_graphql.drv
  /nix/store/3z1xys363vm118i12bwjbkbz822h7azi-vm-test-run-pg_graphql.drv