Replace complex awk-based parsing with simpler sed-based approach for updating Docker image tags in values.yaml. The previous awk logic had issues detecting changes properly. Changes: - Use sed for both WordPress and Nginx tag replacements (more reliable) - Simplify version extraction using sed and cut commands - Fix backfile creation to avoid overwriting during edits - Add debug output showing current and new versions - Improve error handling in diff command (redirect stderr) The sed approach: 1. Matches the image section (wordpress: or nginx:) 2. Performs substitution until the next top-level key 3. Directly replaces the entire tag value with quotes This ensures: - Correct YAML structure preservation - Reliable change detection - Accurate version comparison for Chart.yaml update decision Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>