fix(ci): fix release workflow regex parsing error

[JasonXuDeveloper]

Summary

• Fix bash syntax error in release workflow changelog generation
• Store regex pattern in variable to avoid parsing issues

Problem

The release workflow was failing with:

syntax error in conditional expression: unexpected token `)'

The regex pattern ^([a-z]+)(\(([^)]+)\))?!?:\ (.+)$ contains parentheses and brackets that bash was misinterpreting during script expansion.

Solution

Store the regex pattern in a variable first:

COMMIT_PATTERN='^([a-z]+)(\(([^)]+)\))?!?:[[:space:]](.+)$'
if [[ $subject =~ $COMMIT_PATTERN ]]; then

This prevents bash from parsing the special characters during expansion.

Test plan

• Run the release workflow again after merging
• Verify changelog generation works correctly
• Check that conventional commits are properly parsed

🤖 Generated with Claude Code

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[github-actions]

Unity Test Results

✅ EditMode: All tests passed
✅ PlayMode: All tests passed

Unity Version: 2022.3.55f1
Project Path: UnityProject

✅ All tests passed! The PR is ready for review.

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