these 2 derivations will be built:
  /nix/store/kw65j1b111g9s7srqyd23zdqvf54g536-nixos-test-driver-pg_net.drv
  /nix/store/qwfkpypqw6zi0v4q2xgagm9h9xlbqmjj-vm-test-run-pg_net.drv