How can I install `neofetch` on SteamOS?

I want to run neofetch in my Konsole to see my system information on SteamOS, but neofetch isn't installed by default because I get the following:

bash: neofetch: command not found

So I searched online a bit and seems you can install it using the following command:

sudo pacman -S neofetch 

But then I get an error. The error I'm getting and seeing is this:

error: failed to init transaction (unable to lock database)

error: could not lock database: Read-only file system

Is it even possible to run neofetch on SteamOS? How can I install or run neofetch on SteamOS?

EDIT:

I've made some progress on installing it. First I ran the following commands in order to enable editing on my read-only image:

sudo steamos-readonly disable sudo pacman-key --init 

And if I run sudo pacman -S neofetch now, then I get the following error:

error: neofetch: signature from "GitLab CI Package Builder [email protected]" is unknown trust :: File /var/cache/pacman/pkg/neofetch-7.1.0-2-any.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).

I also tried the commands from this link:

sudo steamos-readonly disable sudo pacman-key --init sudo pacman-key --populate archlinux sudo pacman -Syu sudo steamos-readonly enable 

But that results in the following:

error: failed to commit transaction (invalid or corrupted package (PGP signature)). Errors occurred, no packages were upgraded.

And I also tried sudo pacman -Sy archlinux-keyring as suggested in the comments, but that results in the following error:

error: failed to synchronize all databases (unable to lock database)