add support to pass in a aclfile

[34fathombelow]

We have the ability to use the --aclfile option as an arg but no way to inject this file. A secret mounted through a volume would work. I'm also open to other options.

Thanks for this awesome project!

[Pothulapati]

Thanks @34fathombelow for the kind words!

Its a valid feature request, and should be straightforward to implement.