fix: Sort filelists creating when building ubuntu-cpc images (LP: #2033677)

The image filelists created during ubuntu-cpc project image builds were not sorted.

Soring the filelists makes it easier to compare the filelists without needing to sort first.

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (23.10.30) mantic; urgency=medium
+
+  * fix: Sort filelists creating when building ubuntu-cpc images (LP: #2033677)
+
+ -- Philip Roche <phil.roche@ubuntu.com>  Thu, 31 Aug 2023 18:20:23 +0100
+
 livecd-rootfs (23.10.29) mantic; urgency=medium
 
   * canary: switch to use the live task, try to use KERNEL_FLAVOURS instead

live-build/functions

@@ -47,7 +47,7 @@ create_manifest() {
     if [ "$PROJECT" = ubuntu-cpc ]; then
         echo "create_manifest creating file listing."
         local target_filelist=${2%.manifest}.filelist
-        (cd "${chroot_root}" && find -xdev) > "${target_filelist}"
+        (cd "${chroot_root}" && find -xdev) | sort > "${target_filelist}"
     fi
     echo "create_manifest finished"
 }