these 2 derivations will be built:
  /nix/store/bbqpnmyksz3nm0wr96dkq6m0xn51088a-nixos-test-driver-pg_jsonschema.drv
  /nix/store/g61hlfcw5bsbdzbig74gbr656d54rh5c-vm-test-run-pg_jsonschema.drv