Use cohort key for prepare-image.

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (24.10.27) UNRELEASED; urgency=medium
+
+  * Set UBUNTU_STORE_COHORT_KEY="+" to prepare-image to make sure we simply
+    use the latest snap versions regardless of phasing state.
+
+ -- Łukasz 'sil2100' Zemczak <lukasz.zemczak@ubuntu.com>  Tue, 08 Oct 2024 13:06:10 +0100
+
 livecd-rootfs (24.10.26) oracular; urgency=medium
 
   * Use generic kernel flavor for Nezha D1 and LicheeRV Dock.

live-build/ubuntu/hooks/020-ubuntu-enhanced-sb.binary

@@ -120,7 +120,7 @@ fi
 
 reset_snapd_state chroot
 
-env SNAPPY_STORE_NO_CDN=1 snap prepare-image \
+env SNAPPY_STORE_NO_CDN=1 UBUNTU_STORE_COHORT_KEY="+" snap prepare-image \
     --classic config/classic-model.model $channel chroot
 mv chroot/system-seed/systems/* chroot/system-seed/systems/enhanced-secureboot-desktop
 rm -rf chroot/var/lib/snapd/seed