chore(dockerfile): update archlinux packages

https://hub.docker.com/_/archlinux/?tab=description says:
"Arch Linux is a rolling release distribution, so a full update is recommended
when installing new packages. In other words, we suggest to either execute RUN
pacman -Syu immediately after your FROM statement or as soon as you docker run
into a container."

Without this there are some errors about LIBC_2.36 when installing new
packages brings in packages depending on it, but the installed libc is
still 2.35.

Signed-off-by: Edwin Török <edwin@etorok.net>

Author: edwintorok

tools/Dockerfile

@@ -16,7 +16,7 @@ ENV \
 	PATH="/home/doom/.local/bin:${PATH}"
 
 # Update repositories
-RUN	pacman -Syy
+RUN	pacman -Syu --noconfirm
 
 # Install neovim
 RUN pacman -Sy neovim --noconfirm