these 2 derivations will be built:
  /nix/store/ac6c6y3lx193bsdm0fgalym6wv33496a-nixos-test-driver-pg_repack.drv
  /nix/store/pajmdj6wkxriwkpz68333aisjc7xb331-vm-test-run-pg_repack.drv