feat: add umask configuration support

[wanglu-cell]

Which issue(s) this PR fixes: Fixes #

What this PR does / why we need it: 增加 umask 配置支持，使日志文件权限控制更灵活。当用户需要指定非默认文件权限时，可通过配置 umask 参数实现。 Docs Changes: 无 Release Note: 新增功能: 支持通过 umask 参数控制输出文件权限

[daipom]

Thanks for your contribution!

Could you please clarify what this PR does?

Fluentd already has umask command line option.

• https://docs.fluentd.org/deployment/command-line-option

The limitation of this option is:

• There is no system config option yet.
• It works only when using --daemon or --no-supervisor.
  • For example, it does not work when using Docker.

[cosmo0920]

如果您添加了新的配置项，请同步更新配置文档。

新增功能：支持通过 umask 参数控制输出文件权限。

对于这类行为，建议在官方文档中予以明确说明。

此外，请遵循 DCO 要求，在提交记录（commit）中添加 Signed-off-by 行。

[github-actions[bot]]

This PR has been automatically marked as stale because it has been open 30 days with no activity. Remove stale label or comment or this PR will be closed in 7 days

[github-actions[bot]]

This PR was automatically closed because of stale in 7 days