these 2 derivations will be built:
  /nix/store/41vll2lfvzjrp0xv3s4f95sw3za39chr-nixos-test-driver-pg_repack.drv
  /nix/store/15i3ivkdpxk58knrig1yysxpf04zqlrb-vm-test-run-pg_repack.drv