this derivation will be built:
  /nix/store/mahy0c5q3040acw6y92b5vmgxz22393b-vm-test-run-postgis.drv
this path will be fetched (3.7 KiB download, 15.0 KiB unpacked):
  /nix/store/n5bkwz83bsyqvdsxq5s4pnhkzqnr2j6b-nixos-test-driver-postgis