Merge pull request #709 from YDX-2147483647/cliff

ci: Improve release notes for pre-releases

Merge pull request #708 from YDX-2147483647/ci

ci: Correct file paths and allow testing `release.yml`

Merge pull request #707 from YDX-2147483647/split

拆分`bithesis.dtx`到`src/bithesis*.dtx`

chore: update version to 3.8.7

Relates to #703

chore: update version to 3.8.6

Relates to #686

Merge pull request #661 from YDX-2147483647/ci

ci: Fix `make pkg-only`

chore: update version to 3.8.5

Relates to #658

feat: 渲染题名页时若发现行溢出，发出警告并提示换行

ci: Fix `fd: command not found`

https://github.com/BITNP/BIThesis/releases/tag/v3.8.5-alpha-1

ci: 设置测试版的版本号

Relates-to: #625