these 2 derivations will be built:
  /nix/store/kzvzr2y67p11kc0vglay2m0k1pda5s5r-nixos-test-driver-pg_repack.drv
  /nix/store/gr40jf294mh0h5s8j35bw1f915pbg62i-vm-test-run-pg_repack.drv