these 2 derivations will be built:
  /nix/store/xz08f7zwz8mhdb7fhgch9qkb47f1lccc-nixos-test-driver-pg_net.drv
  /nix/store/1xpi0ddbw0qs84wb07i1yyvd87ha4jxz-vm-test-run-pg_net.drv