these 2 derivations will be built:
  /nix/store/xh8n1jnv1ix71q63x4iwlfjrfvs8c1q6-nixos-test-driver-plpgsql_check.drv
  /nix/store/kqb6rdanb23zj2jlyxb7gppmdf14vrlv-vm-test-run-plpgsql_check.drv