these 2 derivations will be built:
  /nix/store/h0ph7qwdyd1lpvg102p83j3zpaxqrx1k-nixos-test-driver-pg_net.drv
  /nix/store/0jgac7qvc8r7vckc0yc68q0apwlhk8mz-vm-test-run-pg_net.drv