Make PROPOSED=1 builds work with NotAutomatic (lunar and later). LP: #2016022.

debian/changelog

@@ -1,6 +1,8 @@
 livecd-rootfs (2.823) UNRELEASED; urgency=medium
 
   * Update infinite_scream URL to mastodon
+  * Make PROPOSED=1 builds work with NotAutomatic (lunar and later).
+    LP: #2016022.
 
  -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 12 Apr 2023 09:37:47 -0700
 

live-build/auto/config

@@ -1476,6 +1476,14 @@ deb $LB_PARENT_MIRROR_BINARY_VOLATILE $SUITE-proposed $LB_PARENT_ARCHIVE_AREAS
 EOF
 	cp -a config/archives/proposed.list.chroot \
 	      config/archives/proposed.list.binary
+
+	mkdir -p config/chroot_apt/
+	cat > config/chroot_apt/proposed.pref <<EOF
+# override for NotAutomatic: yes
+Package: *
+Pin: release a=*-proposed
+Pin-Priority: 500
+EOF
 fi
 
 case $PROJECT:${SUBPROJECT:-} in