Maintenance: Hint CSRF error fix

[dargmuesli]

Source: https://community.zammad.org/t/csrf-token-verification-failed-issue-reverse-proxy-https-setup/17678/3

Finding this took me way too long 😉

[MrGeneration]

In my opinion this is indirectly already available:

https://docs.zammad.org/en/latest/getting-started/configure-webserver.html?highlight=csrf

[dargmuesli]

I see, interesting find. I've primarily been looking at the docker documentation for my setup, that's why I think it's reasonable to add a hint to it too. The webserver setup page reads to be aimed at people who actually want to go into configuring a webserver which you'd like to generally "avoid" in the Docker case in which environment variables are the configuration api in that sense. Thus, I think a pointer to the potential CSRF issue fix in the environment variable documentation is very helpful.

---

Ah, speaking about which, I just notice that the page I wanted to edit is this:

• https://docs.zammad.org/en/latest/install/docker-compose/environment.html

But on the current default branch that seems to have been moved to:

• https://docs.zammad.org/en/latest/appendix/configure-env-vars.html

But I think the reason given above still stands.

[ralf401]

@dargmuesli thanks for your PR. Looks good to me and I would argue it doesn't hurt to have it there too.