these 2 derivations will be built:
  /nix/store/52r5fd61k25cr3n61nz4654lkrjxknpi-nixos-test-driver-postgis.drv
  /nix/store/7nsbzdxlncznrh6z0h4qcwzvl7dw3zpc-vm-test-run-postgis.drv