Parameterize and consolidate live image definitions for flavors using a common pattern

debian/changelog

@@ -11,6 +11,8 @@ livecd-rootfs (23.10.33) UNRELEASED; urgency=medium
   * live-build/auto/config: various refactors to eliminate code duplication
   * Drop references to ubuntu-dvd, obsolete after precise.
   * Drop references to mythbuntu, obsolete after xenial.
+  * Parameterize and consolidate live image definitions for flavors using
+    a common pattern
 
  -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 06 Sep 2023 11:23:17 -0700
 

live-build/auto/config

@@ -828,9 +828,9 @@ case $PROJECT in
 		esac
 		;;
 
-	ubuntu-gnome)
-		add_task install minimal standard ubuntu-gnome-desktop
-		LIVE_TASK='ubuntu-gnome-live'
+	ubuntu-gnome|ubuntu-unity)
+		add_task install minimal standard ${PROJECT}-desktop
+		LIVE_TASK=${PROJECT}-live
 		;;
 
 	ubuntu-budgie)
@@ -885,11 +885,6 @@ case $PROJECT in
 		LIVE_TASK='ubuntu-mate-live'
 		;;
 
-	ubuntu-unity)
-		add_task install minimal standard ubuntu-unity-desktop
-		LIVE_TASK=ubuntu-unity-live
-		;;
-
 	ubuntustudio-dvd)
 		add_task install minimal standard ubuntustudio-desktop ubuntustudio-audio ubuntustudio-graphics ubuntustudio-video ubuntustudio-photography
 		case $ARCH in