Add create_release script

Author: zombiezen

create_release.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Copyright 2025 The zb Authors
+# SPDX-License-Identifier: MIT
+
+set -euo pipefail
+
+tag="$1"
+dir_name="zb-stdlib-${tag}"
+output_file="${dir_name}.tar.gz"
+
+git archive \
+  --format tar.gz \
+  -6 \
+  --prefix="$dir_name/" \
+  --output="$output_file" \
+  "$tag"
+sha256sum "$output_file"