these 2 derivations will be built:
  /nix/store/g86yjdmpgw2r1damm8zr1a1rpxy2piyn-nixos-test-driver-pg_graphql.drv
  /nix/store/ajnjb3k21sylqzk4lfdz7spxl9sgd6ch-vm-test-run-pg_graphql.drv