feat: addon rss forwarder (#876)

Co-authored-by: Devin Buhl <onedr0p@users.noreply.github.com>

bootstrap/tasks/addons/main.yaml

@@ -27,3 +27,7 @@
 - name: Process addon weave-gitops
   when: weave_gitops.enabled | default(false)
   ansible.builtin.include_tasks: weave_gitops.yaml
+
+- name: Process addon discord-template-notifier
+  when: discord_template_notifier.enabled | default(false)
+  ansible.builtin.include_tasks: discord_template_notifier.yaml