these 2 derivations will be built:
  /nix/store/nnqm7641mgjqydyd0jjgjl97m5kkdyc0-nixos-test-driver-pg_graphql.drv
  /nix/store/gk8l7pa0adbprxsxf3jrnjfx1srnnv5k-vm-test-run-pg_graphql.drv