this derivation will be built:
  /nix/store/3qjfaaxa170bd3f61xavnisar15clj4s-vm-test-run-pg_cron.drv
this path will be fetched (3.9 KiB download, 16.6 KiB unpacked):
  /nix/store/vyghnv921d9hszsg732wkwd567gsxbz1-nixos-test-driver-pg_cron