add script to fetch netbox data and write to local files

packages/fetch-netbox-data/default.nix

@@ -0,0 +1,23 @@
+{ python3 }:
+python3.pkgs.buildPythonApplication {
+  name = "fetch-netbox-data";
+  version = "1.0.0";
+  src = ./.;
+  pyproject = false;
+
+  propagatedBuildInputs = with python3.pkgs; [
+    pynetbox
+    dnspython
+  ];
+
+  installPhase = ''
+    runHook preInstall
+    install -Dm755 ./fetch-netbox-data.py $out/bin/fetch-netbox-data
+    runHook postInstall
+  '';
+
+  meta = {
+    mainProgram = "fetch-netbox-data";
+    platforms = python3.meta.platforms;
+  };
+}