Add 'file' param support on config files [ module.exports = (ctx: { cwd, env, *file }) => ${config} ] #4653
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Description
Clear and concise description of the problem
postcss.config.js 配置中无法获取到file，导致无法去区分不同尺寸的UI来做转换（例如vant的设计图尺寸为375，而其他为750）
Suggested solution
postcss.config.js中增加file参数
Alternative
No response
Additional context
No response
Validations
- Follow our Code of Conduct
- Read the Contributing Guidelines.
- Read the docs.
- Check that there isn't already an issue that request the same feature to avoid creating a duplicate.