these 2 derivations will be built:
  /nix/store/q4rjna7f25ryz894q2wpkwv6lh415sh7-nixos-test-driver-pg_repack.drv
  /nix/store/7i5f5szhlq0b54zzbynm1prkj1zk6qbl-vm-test-run-pg_repack.drv