Generate manifest for HyperV desktop images

Manifests are necessary for candidate checking in the
CPC automated workflow for building and publishing
HyperV desktop images. (#1940136)

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.525.56) UNRELEASED; urgency=medium
+
+  [ Jason C. McDonald ]
+  * Generate manifest for HyperV desktop image. (LP: #1940136)
+
+ -- Jason C. McDonald <codemouse92@outlook.com>  Mon, 16 Aug 2021 14:30:14 -0700
+
 livecd-rootfs (2.525.55) bionic; urgency=medium
 
   [ Thomas Bechtold ]

live-build/ubuntu/hooks/040-hyperv-desktop-images.binary

@@ -125,4 +125,7 @@ rm "$raw_img"
 
 apt-get install -y zip
 zip "$vhd_img.zip" "$vhd_img"
+
+create_manifest chroot "$vhd_img.zip.manifest"
+
 rm "$vhd_img"