these 2 derivations will be built:
  /nix/store/8ybb4v1amixakga9dmi7khfjawsc7jhi-nixos-test-driver-pg_tle.drv
  /nix/store/bc4dvacnfrxjjk5k0jyhf6ipagqd4fyh-vm-test-run-pg_tle.drv