these 2 derivations will be built:
  /nix/store/g8lhg4yg2j8wariln40mj664s1bfd5ji-nixos-test-driver-pg_repack.drv
  /nix/store/9wndiq25i2dxhvjr6d4v08j4v37cn2ac-vm-test-run-pg_repack.drv