feat: Add Gitea Actions CI/CD pipeline for releases (v0.4.0)

- Automated release builds triggered by v* tags
- PHP 8.3 environment with production dependencies
- Automatic translation compilation (.po to .mo)
- Version verification (plugin version must match tag)
- WordPress-compliant zip structure
- SHA256 checksum generation
- Package structure verification
- Changelog extraction for release notes
- Automatic Gitea release creation with attachments

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,22 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.0] - 2026-01-29
+
+### Added
+
+- Gitea Actions CI/CD pipeline for automated release package creation
+  - Triggered by `v*` tags
+  - PHP 8.3 environment with production dependencies
+  - Automatic translation compilation (.po to .mo)
+  - Version verification (plugin version must match tag)
+  - WordPress-compliant zip structure
+  - SHA256 checksum generation
+  - Package structure verification
+  - Changelog extraction for release notes
+  - Automatic Gitea release creation with attachments
+  - Pre-release detection for tags containing `-`
+
 ## [0.3.0] - 2026-01-29
 
 ### Added
@@ -175,7 +191,9 @@ Initial release of WP FediStream - a WordPress plugin for streaming music over A
 
 ---
 
-[Unreleased]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.2.0...HEAD
+[Unreleased]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.0...HEAD
+[0.4.0]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.3.0...v0.4.0
+[0.3.0]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.2.0...v0.3.0
 [0.2.0]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.1.1...v0.2.0
 [0.1.1]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.1.0...v0.1.1
 [0.1.0]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/releases/tag/v0.1.0