Steam Deck HowTo - Installing Pacman Packages In Userspace

I recently bought a Steam Deck with the intention of using it as a portable Linux machine as much as a game console. The Steam Deck has a read-only operating system root that is entirely replaced when the system is updated so executables can’t be installed normally with pacman. However, userspace is still persisted and executables can be installed there. Here’s how I set up a userspace root with pacman -r.