Using env reference within file reference doesn't work

[jadamon42]

The following cannot be parsed:
"${file(${env:FILE_PATH}/config.global.yml)}"

This could be fixed in a hacky way by doing something like:

if (
    functionName === "file" &&
    _arguments.length >= 1 &&
    typeof _arguments[_arguments.length - 1] === "string" &&
    _arguments[_arguments.length - 1].includes(path.sep) &&
    child.value[0] === path.sep
) {
    let previousValue = _arguments.pop()
    _arguments.push(previousValue + child.value)

on line 484 of src/template-compiler/index.ts, but I imagine you'd have a more elegant solution. I'm not real good with javascript/typescript.