fix(build.sh): remove rm -rf .git/

[elysia-best]

Summary / 摘要

移除构建脚本中的 rm -rf .git/，防止gh-cli报错。同时限制了checkout深度，以免仓库过大。

• This PR has breaking changes.
  / 此 PR 包含破坏性变更。
• This PR changes public API, config, storage format, or migration behavior.
  / 此 PR 修改了公开 API、配置、存储格式或迁移行为。
• This PR requires corresponding changes in related repositories.
  / 此 PR 需要关联仓库同步修改。

Related repository PRs / 关联仓库 PR:

• OpenList-Frontend:
• OpenList-Docs:

Related Issues / 关联 Issue

Testing / 测试

• go test ./...
• Manual test / 手动测试:

Checklist / 检查清单

• I have read CONTRIBUTING.
  / 我已阅读 CONTRIBUTING。
• I confirm this contribution follows the repository license, contribution policy, and code of conduct.
  / 我确认此贡献符合仓库许可证、贡献规范和行为准则。
• I have formatted the changed code with gofmt, go fmt, or prettier where applicable.
  / 我已按适用情况使用 gofmt、go fmt 或 prettier 格式化变更代码。
• I have requested review from relevant maintainers or code owners where applicable.
  / 我已在适用情况下请求相关维护者或代码所有者审查。

[Copilot]

Pull request overview

This PR removes destructive cleanup of the repository’s .git/ directory from build.sh to avoid breaking Git-based tooling during builds (e.g., gh CLI), and updates the release workflow checkout to use a shallow fetch while still fetching tags.

Changes:

• Removed rm -rf .git/ from multiple build entrypoints in build.sh.
• Updated .github/workflows/release.yml to use fetch-depth: 1 and enable tag fetching during checkout.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
build.sh	Stops deleting .git/ during build targets to keep Git metadata available for tooling.
.github/workflows/release.yml	Uses a shallow checkout while attempting to preserve tag availability for release builds.

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