Merge branch 'pr-14399' into omarchycn

# Conflicts:
#	bin/omarchy-refresh-pacman
#	install/post-install/pacman.sh

default/regions/cn/packages

@@ -0,0 +1,2 @@
+# Installed from the ISO's offline repository before enabling ArchLinuxCN.
+archlinuxcn-keyring

default/regions/cn/pacman/mirrorlist.append

@@ -0,0 +1 @@
+Server = https://mirrors.ustc.edu.cn/archlinux/$repo/os/$arch

default/regions/cn/pacman/pacman.conf.append

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+[archlinuxcn]
+Server = https://mirrors.ustc.edu.cn/archlinuxcn/$arch

default/regions/cn/timezone

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+Asia/Shanghai