[CI] Add workflow to cleanup L2 ccache weekly

[SigureMo]

PR Category

Execute Infrastructure

PR Types

Devs

Description

完成 #77174 的 TODO，实现 weekly L2 ccache 自动清理到 200G，限制到 57G 时的清理效果如下：

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[Copilot]

Pull request overview

This PR implements automated weekly cleanup of L2 ccache by adding a GitHub Actions workflow. The workflow runs on a schedule (weekly on Sundays) to evict ccache entries older than 15 days, helping to manage disk space on CI infrastructure.

• Adds a scheduled GitHub Actions workflow that runs weekly on Sundays
• Uses a Docker container to install ccache and perform cleanup operations
• Evicts ccache entries older than 15 days from the L2 cache directory

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[Copilot]

This line should be removed before merging to production as indicated by the inline comment. The pull_request trigger on the develop branch appears to be for testing purposes only and should not be present in the final merged version.

Suggested change

	pull_request:
	branches: [develop] # Remove before merge, just for testing