add 1.6.5 release notes

Author: csuzhangxc

en/releases/release-1.6.5.md

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+---
+title: TiDB Operator 1.6.5 Release Notes
+summary: Learn about new features, improvements, and bug fixes in TiDB Operator 1.6.5.
+---
+
+# TiDB Operator 1.6.5 Release Notes
+
+Release date: January 23, 2026
+
+TiDB Operator version: 1.6.5
+
+## New features
+
+- Support `VolumeAttributesClass` for TiDBCluster components to dynamically manage volume attributes such as IOPS and throughput ([#6568](https://github.com/pingcap/tidb-operator/pull/6568), [@WangLe1321](https://github.com/WangLe1321))
+
+## Improvements
+
+- Change the shell interpreter of backup-related scripts from `sh` to `bash` for better compatibility with bash-specific features ([#6618](https://github.com/pingcap/tidb-operator/pull/6618), [@liubog2008](https://github.com/liubog2008))
+
+## Bug fixes
+
+- Fix the issue that the controller retries indefinitely when a log backup task is not found in etcd by updating the Backup CR status to `Failed` ([#6630](https://github.com/pingcap/tidb-operator/pull/6630), [@RidRisR](https://github.com/RidRisR))
+- Fix the compatibility issue with some Kubernetes versions (e.g. v1.33) where the operator incorrectly attempts to recreate existing resources in every sync cycle ([#6653](https://github.com/pingcap/tidb-operator/pull/6653), [@cicada-lewis](https://github.com/cicada-lewis))

zh/releases/release-1.6.5.md

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+---
+title: TiDB Operator 1.6.5 Release Notes
+summary: 了解 TiDB Operator 1.6.5 版本的新功能、优化提升，以及 Bug 修复。
+---
+
+# TiDB Operator 1.6.5 Release Notes
+
+发布日期：2026 年 1 月 23 日
+
+TiDB Operator 版本：1.6.5
+
+## 新功能
+
+- 支持为 TiDBCluster 组件配置 `VolumeAttributesClass`，从而能够动态管理卷属性（如 IOPS 和吞吐量） ([#6568](https://github.com/pingcap/tidb-operator/pull/6568), [@WangLe1321](https://github.com/WangLe1321))
+
+## 优化提升
+
+- 将备份相关脚本的 shell 解释器从 `sh` 修改为 `bash`，以更好地支持 bash 特有语法 ([#6618](https://github.com/pingcap/tidb-operator/pull/6618), [@liubog2008](https://github.com/liubog2008))
+
+## Bug 修复
+
+- 修复当 etcd 中找不到日志备份任务时控制器无限重试的问题，在此情况下会将 Backup CR 状态更新为 `Failed` ([#6630](https://github.com/pingcap/tidb-operator/pull/6630), [@RidRisR](https://github.com/RidRisR))
+- 修复与部分 Kubernetes 版本（如 v1.33）的兼容性问题，避免 TiDB Operator 在每个同步周期内重复尝试创建已存在的资源 ([#6653](https://github.com/pingcap/tidb-operator/pull/6653), [@cicada-lewis](https://github.com/cicada-lewis))