chore: release v0.21.1 (#342)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: powerman

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.21.1] - 2025-07-12
+
+[0.21.1]: https://github.com/powerman/dockerize/compare/v0.21.0..v0.21.1
+
 ## [0.21.0] - 2025-07-12
 
 ### 🔔 Changed