these 2 derivations will be built:
  /nix/store/yjsqa28nbkxk8zmaxp9ypjmc7jp3sfkd-nixos-test-driver-pg_repack.drv
  /nix/store/sa1w2d6yp2p8shgyarz71dhf55d396az-vm-test-run-pg_repack.drv