updated installation-docker.md file with Podman instructions #820

In my local build, I omitted the localtime and timezone volumes, as those directories didn't exist in my server (Alma Linux), but I left them in the documentation as I wanted to match the yaml file. Obviously feel free to remove/edit any of the elements. Alternatively, please let me know if there's anything else you'd like for me to add. I only added the essentials, but would be happy to add more if it would make sense to do so.

This is a very useful addition ✨

Could you provide a shell script that verify it works as it should, assuming it runs on a freshly installed Debian GNU/Linux bookworm? I'll take care of adding this script to the CI so it verifies it keeps working.

Bookworm is on v4.3.1, which still uses systemd generator.
Quadlet support is from v4.4 - so it's a no go for a script on bookworm.

Also I'm not sure if that's needed... Do we test if docker-compose files work? Because that's basically the same thing.

In that case it does not seem possible to have an automated test. @j-dominguez9 can you add the Operating System / podman requirements in this section?

@earl-warren yes, of course. Will do that today! I can test it on Fedora Workstation, Fedora silverblue, and Alma/Rocky Linux to verify it works, but don't have access to a debian-based distro right now. And I don't know if testing it on a deb container would make sense, since weird stuff starts happening when you run a container inside a container.

I did have to remove the timezone and localtime volumes for it to work on rpm-based setups. Don't know if that will remain the case for deb-based setups, as well. Also, added a mention of SSH testing, as I struggled with that when setting mine up (still haven't fully figured out how to point git to a different port), but happy to remove it, if you think it adds unnecessary information.

@thefox I'll leave the review to you as I don't know podman myself.

@j-dominguez9 could you please fix the lint issues so it can be merged?

Sorry for the noise ... Compare the actual change

Preview ready: https://forgejo.codeberg.page/@docs_pull_820/