Switch out Taiwan with Australia

At least one mirror in Taiwan seems to be incomplete/broken right now.

build_files/common/packages.sh

@@ -65,7 +65,7 @@ rm \
 
 # Add country query to all repo metalinks
 # shellcheck disable=SC2016
-sed -i -e '/^metalink\=/s/\$releasever\&arch\=\$basearch$/\$releasever\&arch\=\$basearch\&country\=KR,JP,TW/g' /etc/yum.repos.d/*.repo
+sed -i -e '/^metalink\=/s/\$releasever\&arch\=\$basearch$/\$releasever\&arch\=\$basearch\&country\=KR,JP,AU/g' /etc/yum.repos.d/*.repo
 
 # Add 1Password repo
 #rpmkeys --import https://downloads.1password.com/linux/keys/1password.asc