add comment about touching

cdist/conf/type/__package_apt/gencode-remote

@@ -93,6 +93,7 @@ case "$state_should" in
         # https://code.ungleich.ch/ungleich-public/cdist/-/issues/861
         apt_opts="-o Acquire::AllowReleaseInfoChange::Suite=true -o Acquire::AllowReleaseInfoChange::Version=true"
         if [ "$(cat "$__object/explorer/index")" = 'update' ]; then
+            # make /var/lib/apt/lists newer because apt-get update might not always do this
             echo 'if [ -d /var/lib/apt/lists ]; then touch /var/lib/apt/lists; fi'
             echo "apt-get $apt_opts update || true"
         fi