these 2 derivations will be built:
  /nix/store/jfc76l2apsjqxykfwpp7ddidnjmfa2mk-nixos-test-driver-pg_net.drv
  /nix/store/jbzqiibjyjhm7d8jhmaa8b5r6cdyq5y4-vm-test-run-pg_net.drv