add 32bit packages

[taukakao]

Some packages like steam-installer require 32bit packages.

dpkg --add-architecture i386
does not help, since these packages don't exist in the repos.

[mirkobrombin]

Not sure if adding 32bit packages (which would increase the repo drastically) just for steam is a good idea. I would suggest the flatpak.

[rowbawts]

Yes using Steam Flatpak solves this with a lot less work and to my knowledge there's not many (if any) limitations to using the Flatpak.

[taukakao]

Many modding apps are not compatible with the flatpak yet.
But it's true that adding 32bit support for just steam would be quite excessive, especially since you can install it through apx.
I would leave this issue open anyway in case other apps requiring 32bit support are reported.