Start building rousette

Also, given that the CI-built images were already peaking at 395 MB used
in rootfs, add some breathing space.

Change-Id: Ia1b3485364ba0f3fa23b77c867ff51a9d8cefacc
diff --git a/package/Config.in b/package/Config.in
index 4d73ced..95d41c6 100644
--- a/package/Config.in
+++ b/package/Config.in
@@ -8,3 +8,4 @@
 source "$BR2_EXTERNAL_CZECHLIGHT_PATH/package/velia/Config.in"
 source "$BR2_EXTERNAL_CZECHLIGHT_PATH/package/grub2-tools/Config.in"
 source "$BR2_EXTERNAL_CZECHLIGHT_PATH/package/reset-sysrepo/Config.in"
+source "$BR2_EXTERNAL_CZECHLIGHT_PATH/package/rousette/Config.in"