these 2 derivations will be built:
  /nix/store/r3z5vg88z584xdq8fyz5sl11s50lmlan-nixos-test-driver-pg_partman.drv
  /nix/store/vnlly1p1c98s6qbg3fyqmj54abvrrai8-vm-test-run-pg_partman.drv