these 2 derivations will be built:
  /nix/store/9srjaccf66lqn1ka9w8kc1v6c4pbhrqf-nixos-test-driver-pg_graphql.drv
  /nix/store/w94fw9cgdjhy67yzm0y6q8wwwgc5anpi-vm-test-run-pg_graphql.drv