archlinux: Change the default mirror

Signed-off-by: Stéphane Graber <stgraber@stgraber.org>

Author: stgraber

images/archlinux.yaml

@@ -236,6 +236,15 @@ packages:
     - desktop-gnome
 
 actions:
+- trigger: post-unpack
+  action: |-
+    #!/bin/sh
+    set -eux
+
+    echo 'Server = https://mirror.csclub.uwaterloo.ca/archlinux/$repo/os/$arch' > /etc/pacman.d/mirrorlist
+  architectures:
+  - x86_64
+
 - trigger: post-unpack
   action: |-
     #!/bin/sh