fix: Do not install recommends for ubuntu-cpc minimized project (LP: #2031640)

For minimized images we do not want to install any recommended packages.
We can do this by setting APT::Install-Recommends to false in apt config
or by passing --no-install-recommends to apt-get install.

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (23.10.16) mantic; urgency=medium
+
+  * fix: Do not install recommends for ubuntu-cpc minimized project (LP: #2031640)
+
+ -- Philip Roche <phil.roche@ubuntu.com>  Thu, 17 Aug 2023 11:44:23 +0100
+
 livecd-rootfs (23.10.15) mantic; urgency=medium
 
   [ Stefan Hammer ]

live-build/auto/config

@@ -1106,6 +1106,12 @@ case $PROJECT in
 		KERNEL_FLAVOURS=virtual
 
 		if [ "${SUBPROJECT:-}" = minimized ]; then
+		    # For minimized images we do not want to install any recommended packages.
+		    # We can do this by setting APT::Install-Recommends to false in apt config
+		    # or by passing --no-install-recommends to apt-get install.
+		    # Apt config is set using `APT_OPTIONS` variable in this script.
+		    # This fixes LP: #2031640
+		    APT_OPTIONS="${APT_OPTIONS:+$APT_OPTIONS }--no-install-recommends"
 			add_package install ubuntu-cloud-minimal
 		else
 			add_task install minimal standard cloud-image