these 2 derivations will be built:
  /nix/store/50vblwhmxxbar7qv0rhjs4jps1s8k3av-nixos-test-driver-pg_repack.drv
  /nix/store/8agbs4aq1w9n7spgkscpwk035n73ld18-vm-test-run-pg_repack.drv