Fix/rolling logger

[Snow-kal]

变更内容

修复 logger/rolling 样例运行后未生成 logs.log 的问题。

主要修改：

• 在 logger/rolling/conf/dubbogo.yml 中增加 appender: file

  • dubbo-go logger 默认 appender 是 console
  • 仅配置 logger.file 不会自动启用文件输出
  • 显式设置 appender: file 后，日志会写入 logs.log

• 调整 logger/rolling/cmd/main.go 的日志输出频率

  • 每轮日志输出后增加 time.Sleep(time.Second * 1)
  • 与其他 logger 样例保持一致
  • 避免 3 秒内过快刷日志导致样例行为不直观

• 更新 logger/README.md 和 logger/README_zh.md

  • 说明文件输出需要配置 appender: file
  • 说明从 logger/rolling 目录运行时，logs.log 会生成在 logger/rolling/logs.log
  • 补充如需同时输出控制台和文件，可使用 appender: console,file

验证方式

在 PowerShell 中执行：

cd logger/rolling
$env:DUBBO_GO_CONFIG_PATH = "./conf/dubbogo.yml"
go run ./cmd/main.go
Get-ChildItem .\logs.log
Get-Content .\logs.log -Tail 20

issue #1075

[Copilot]

Pull request overview

This PR fixes the logger/rolling sample so it actually writes logs to logs.log by explicitly enabling the file appender, and adjusts sample output pacing to match the other logger examples.

Changes:

• Add appender: file to logger/rolling/conf/dubbogo.yml so file output is enabled.
• Slow down the rolling sample’s log loop with a 1s sleep per iteration.
• Update logger/README.md and logger/README_zh.md to document the need for appender: file and clarify log file location.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
logger/rolling/conf/dubbogo.yml	Enables file appender so the rolling sample creates logs.log.
logger/rolling/cmd/main.go	Adds a 1s delay per loop to make sample output behavior more readable/consistent.
logger/README.md	Documents appender: file and log file location (needs clarification on config root key).
logger/README_zh.md	Same as above for the Chinese README (needs clarification on config root key).

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