these 2 derivations will be built:
  /nix/store/vc2ajx1y55g6596mhyg34rlhrm83r61i-nixos-test-driver-pg_repack.drv
  /nix/store/32d5y4lrdbzhclk6x6g4kzk221jhny75-vm-test-run-pg_repack.drv