whitelist rule not working with arm64 images or images <= 2.2

[trasba]

Hi it took me a while to sort this out. I thought it might be helpful for other people with the same issue.

If you run a docker image with a tag <= 2.2, whitelist in rules is not gonna work.
This also means that no arm(64/v7) image is going to work because the latest arm image is 2.2
The reason is simply the function is not included in the 2.2 release of thomseddon/traefik-forward-auth. The documentation is documenting something that was not included in any release. The code was added after the last release.
An indication telling you that this is your problem is an error like:
invalid route param whitelist
I buildt a container with the latest code and it was working like a charm.

A very easy fix for arm users craving for that very functionality is to use the fork (container) of jordemort (jordemort/traefik-forward-auth) he also merged several pull requests. Just use the docker image:
ghcr.io/jordemort/traefik-forward-auth:latest

cheers 👋