Add slack bot for slack alters

kubernetes/rpi5-cluster/flux-system/notification-controller/repository.yaml

@@ -0,0 +1,10 @@
+apiVersion: source.toolkit.fluxcd.io/v1
+kind: GitRepository
+metadata:
+  name: home-cluster-ops-repo
+  namespace: flux-system
+spec:
+  interval: 60m
+  url: https://github.com/3dwardch3ng/home-cluster-ops
+  ref:
+    branch: master

kubernetes/rpi5-cluster/flux-system/notification-controller/slack-alters.yaml

@@ -0,0 +1,12 @@
+---
+apiVersion: notification.toolkit.fluxcd.io/v1beta3
+kind: Provider
+metadata:
+  name: slack-bot
+  namespace: flux-system
+spec:
+  type: slack
+  channel: general
+  address: https://slack.com/api/chat.postMessage
+  secretRef:
+    name: slack-bot-token