MT#56773 Use bullseye puppetlabs repository for bookworm

To be able to upgrade our internal systems to Debian/bookworm
we need to have puppet packages available.

Upstream still doesn't provide any Debian packages
(see https://tickets.puppetlabs.com/browse/PA-4995),
though their AIO (All In One) packages for Debian/bullseye
seem to be working on Debian/bookworm as well (at least for
puppet-agent). So until we either migrated to puppet-agent
as present in Debian/bookworm or upstream provides according
AIO packages, let's use the puppet-agent packages we already
use for our Debian/bullseye systems.

Change-Id: I2211ffd79f70a2a79873e737b0b512bfb7492328

templates/scripts/includes/deployment.sh

@@ -2374,9 +2374,19 @@ if [ -n "$PUPPET" ] ; then
     grml-chroot "${TARGET}" apt-get -y install dirmngr
   fi
 
+  # puppetlabs doesn't provide packages for Debian/bookworm yet, so use
+  # the AIO packages from the bullseye repos for now,
+  puppet_deb_release="${DEBIAN_RELEASE}"
+  case "${DEBIAN_RELEASE}" in
+    bookworm)
+      puppet_deb_release="bullseye"
+      echo "WARN: enabling ${puppet_deb_release} puppetlabs repository for ${DEBIAN_RELEASE} (see PA-4995)"
+      ;;
+  esac
+
   echo "Installing 'puppet-agent' with dependencies"
   cat >> ${TARGET}/etc/apt/sources.list.d/puppetlabs.list << EOF
-deb ${DEBIAN_URL}/puppetlabs/ ${DEBIAN_RELEASE} main puppet dependencies
+deb ${DEBIAN_URL}/puppetlabs/ ${puppet_deb_release} main puppet dependencies
 EOF
 
   puppet_gpg='/root/puppet.gpg'