feat: addon rss forwarder (#876)

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

bootstrap/templates/addons/discord-template-notifier/ks.yaml.j2

@@ -0,0 +1,16 @@
+---
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: cluster-apps-discord-template-notifier
+  namespace: flux-system
+spec:
+  path: ./kubernetes/apps/default/discord-template-notifier/app
+  prune: true
+  sourceRef:
+    kind: GitRepository
+    name: home-kubernetes
+  wait: false
+  interval: 30m
+  retryInterval: 1m
+  timeout: 5m