[BUG] If a critical mirror is down, the whole Arch Server Setup fails

[KayleighOwO]

Describe the bug

If a critical mirror is down, the whole Arch Server Setup fails. Looking into the mirrors that are set up by the script it only picks the closest servers.

To Reproduce

Steps to reproduce the behavior:

1. Choose the Arch Server Setup option in linutil
2. Follow the process answering all the prompts
3. After setting the closest mirrors, the script tries to download packages
4. If there happens to be a mirror that is down (Error 404), the install fails

Expected behavior

Arch Server should be installed without issue.
Maybe add additional mirrors that are known to be reliable even if they may not be as fast.

Log output

base-devel-1-2-any downloading...
error: failed retrieving file 'linux-lts-6.12.15-1-x86_64.pkg.tar.zst.sig' from za.mirrors.cicku.me : The requested URL returned error: 404
warning: failed to retrieve some files
error: failed to commit transaction (unexpected error)
Errors occurred, no packages were upgraded.
==> ERROR: Failed to install packages to new root

Generated /etc/fstab:

# /dev/vda3
UUID=338ab620-b83d-43be-a6f0-cd376c26acfd       /               ext4            rw,relatime     0 1

# /dev/vda2 LABEL=EFIBOOT
UUID=EEA6-350A          /boot           vfat            rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro   0 2


-------------------------------------------------------------------------
GRUB BIOS Bootloader Install & Check
-------------------------------------------------------------------------

-------------------------------------------------------------------------
Checking for low memory systems <8G
-------------------------------------------------------------------------
chroot: failed to run command ‘/bin/bash’: No such file or directory

Additional context

Above is a snippet from where one of the mirrors seems to be down and cannot download the kernel package

Checklist

• I checked for duplicate issues.
• I checked already existing discussions.
• This issue is not included in the roadmap.
• This issue is present on both stable and development branches.

[KayleighOwO]

seems to be working now, but maybe there could be a more reliable mirror also added to avoid having to wait for mirrors to come back online