this derivation will be built:
  /nix/store/ykp19jiisp8baj1115j273fn1kdj4qh9-vm-test-run-postgis.drv
this path will be fetched (4.0 KiB download, 16.6 KiB unpacked):
  /nix/store/kcjwihwz760j3c4jndn9nyyhccbixrg4-nixos-test-driver-postgis