Add formatting command to nix

Author: lmbollen

nix/bin/format

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# SPDX-FileCopyrightText: 2024 Google LLC
+#
+# SPDX-License-Identifier: Apache-2.0
+ROOT=$(git rev-parse --show-toplevel)
+
+echo "Formatting Cabal files.."
+"${ROOT}"/.github/scripts/cabal-gild.sh
+
+echo "Formatting Rust files.."
+./cargo.sh fmt --all -- --emit files