ci: Improve release notes for pre-releases

[YDX-2147483647]

之前没设置好git-cliff（也可能是git-cliff有缺陷），预发布版的发行说明没有东西，例如 https://github.com/BITNP/BIThesis/releases/tag/v3.8.8-alpha.2 。

原因分析

（非常混乱，但 git-cliff 2.11.0 似乎确实如此……）

之前给git-cliff指定了--unreleased。原以为git cliff --unreleased等于git cliff结果中的[unreleased]部分，实际上只是子集，具体情况要慢慢分析……

git-cliff解析历史时，会把标签分为以下 2+1 = 3 类。分类方法受ignore_tags和tag_pattern两项设置影响，且CLI设置（见.github/workflows/release.yml）会覆盖cliff.toml设置（ignore_tags = ".*alpha|beta|-.*"；tag_pattern未设置，相当于.*）。

• 有效标签：匹配tag_pattern
  • 正式标签：匹配tag_pattern但不匹配ignore_tags
  • 非正式标签：匹配tag_pattern且匹配ignore_tags
• 无效标签：不匹配tag_pattern

在changelog模板中，有三个变量相关：

• version：当前标签，可能为null

  • 若指定了--unreleased，则为null
  • 若指定了--current，则为HEAD对应的标签
  • 若指定了--latest，则为整个历史中的最新标签

  用 release.published 事件触发 GitHub Actions 时，release 对应的标签已经创建了，所以--latest和--current效果相同。

• previous.version：上一正式标签

• commits：从上一有效标签到当前标签的提交记录

  对于当前标签为null的情况，上一有效标签就是HEAD。

以上理论可以解释目前所有现象。

[Copilot]

Pull request overview

This PR improves the release notes generation for pre-releases by fixing git-cliff configuration issues. Previously, pre-release versions had empty release notes due to incorrect usage of the --unreleased flag and configuration settings.

Key changes:

• Enhanced the cliff.toml template to handle public releases, pre-releases, and testing scenarios differently
• Updated the GitHub Actions workflow to use appropriate git-cliff flags based on release type
• Added job summary output for better visibility of generated release notes

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
cliff.toml	Added conditional logic to generate different release note headers for public releases, pre-releases, and testing; duplicated ignore_tags pattern in template to prevent CLI override
.github/workflows/release.yml	Modified git-cliff arguments to use --current for releases and conditional tag filtering for public vs pre-releases; added step to output release notes to job summary

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