CHORE(argocd): disable unused ArgoCD controllers

- notifications: Not using alerts
- applicationset: Not using ApplicationSet templates
- dex: Using Authelia SSO instead
- Saves ~200-300 MiB memory and removes 3-minute reconciliation loop

argocd/disable-unused-controllers.yaml

@@ -0,0 +1,28 @@
+# Disable unused ArgoCD controllers to save resources
+# - notifications: Not using Slack/Discord alerts
+# - applicationset: Not using ApplicationSet templates
+# - dex: Using Authelia for SSO instead
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: argocd-notifications-controller
+  namespace: argocd
+spec:
+  replicas: 0
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: argocd-applicationset-controller
+  namespace: argocd
+spec:
+  replicas: 0
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: argocd-dex-server
+  namespace: argocd
+spec:
+  replicas: 0

argocd/kustomization.yaml

@@ -6,3 +6,4 @@ resources:
 - argocd-rbac-cm.yaml
 - argocd-cmd-params-cm.yaml
 - ingress.yaml
+- disable-unused-controllers.yaml