these 2 derivations will be built:
  /nix/store/967bdacpfm2qlpz586wln4ias4qi62nf-nixos-test-driver-pg_repack.drv
  /nix/store/m3hbpazabks12mfnmbc0z10yis7n0h7k-vm-test-run-pg_repack.drv