fix: only replace path with env var if value defined #557
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fixes #556
The code in question is trying to replace an environment variable name in a file path with it's value. It is assuming that if a segment starts with
$then it is an environment variable name. There are frontend frameworks with file-based routing that use$to indicate a value in a path (ie https://tanstack.com/router/latest/docs/framework/react/guide/file-based-routing). We need to strip the$off of the name to pass toos_getenvbut If there isn't a value for the environment variable, we shouldn't remove the$from the path since this is a valid file and directory name.