these 2 derivations will be built:
  /nix/store/g3gz3mvja030yj5p536kg5aj7gq5ddd8-nixos-test-driver-plpgsql_check.drv
  /nix/store/4bfav02c6b66d011akl14xcj054maw3r-vm-test-run-plpgsql_check.drv