these 2 derivations will be built:
  /nix/store/nmimlylqydqzgr42xq0vvr1y4gzi9ni2-nixos-test-driver-pg_jsonschema.drv
  /nix/store/pmafnh7mhxwj74zwh685xmfif70wnn9h-vm-test-run-pg_jsonschema.drv