this derivation will be built:
  /nix/store/rcbkm6rrhf6158km23hhgx5rl13r3vzi-vm-test-run-pg_cron.drv
this path will be fetched (3.9 KiB download, 16.6 KiB unpacked):
  /nix/store/s4rawcg02qbybfzbvsl1846fsphs11r6-nixos-test-driver-pg_cron