sink到文件中，没有自动创建目录

[GreatLazyMan]

In what area(s)?

/area sink

What version of Loggie?

1.5.0

Expected Behavior

参考官方文档创建sink如下
sink:
type: file
workerCount: 1024
baseDirs:
- /data0
dirHashKey: ${namespace}-${nodename}
filename: /${nodename}/${podame}.log
maxSize: 500
maxAge: 7
maxBackups: 50
compress: true
希望能把日志写入到路径 /data0/${nodename}/${podame}.log

Actual Behavior

实际上日志写入到文件 /data0/${podame}.log ，没有创建目录 ${nodename}

Steps to Reproduce the Problem

创建file sink，filename包含多级子目录