these 2 derivations will be built:
  /nix/store/rgwpl4ga4m2yqvwvf8aspchz42p6izbg-nixos-test-driver-postgis.drv
  /nix/store/zfbkr39qv1vq7cjbs5kc4h8dzamlajgr-vm-test-run-postgis.drv