this derivation will be built:
  /nix/store/ynqzq9k603nzvyxbayz5na1rbgknc6am-vm-test-run-postgis.drv
this path will be fetched (4.0 KiB download, 16.6 KiB unpacked):
  /nix/store/qzyy1bc4h4bq2cm7kcy8mkvlp9cyx19z-nixos-test-driver-postgis