these 4 derivations will be built:
  /nix/store/0xb8a5x2pjb6jd6i16clf77rva2a9sip-test-script.drv
  /nix/store/y6dvc8m5akpl5nkjapd33h0nnvqjlhzc-driverConfiguration.json.drv
  /nix/store/2srs5jv3lscrkwd7ibq4dnxnha9h57k5-nixos-test-driver-postgis.drv
  /nix/store/z4gvilfpb93rfvi4j1gwqy3x9j2b379v-vm-test-run-postgis.drv