Install valkey-operator via helm

Adds the valkey-operator (v0.5.0) as a platform app so a later change can
replace the self-managed redis Deployment with a Valkey CR.

- Add apps/base/valkey-operator-system (namespace)
- Add apps/overlays/au-syd1/valkey-operator-system pulling the valkey-operator
  0.5.0 chart from the artifactapi virtual helm repo, with includeCRDs and the
  operator image routed through the artifactapi ghcr proxy
- Register the app path in the platform ApplicationSet

apps/base/valkey-operator-system/kustomization.yaml

@@ -0,0 +1,6 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml

apps/base/valkey-operator-system/namespace.yaml

@@ -0,0 +1,5 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: valkey-operator-system

apps/overlays/au-syd1/valkey-operator-system/kustomization.yaml

@@ -0,0 +1,17 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../../base/valkey-operator-system
+
+helmCharts:
+  - name: valkey-operator
+    repo: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/virtual/helm
+    version: "0.5.0"
+    releaseName: valkey-operator
+    namespace: valkey-operator-system
+    valuesFile: values.yaml
+    # The chart ships CRDs in the Helm-native crds/ dir, which helm template
+    # skips unless CRDs are explicitly included.
+    includeCRDs: true

apps/overlays/au-syd1/valkey-operator-system/values.yaml

@@ -0,0 +1,14 @@
+image:
+  registry: artifactapi.k8s.syd1.au.unkin.net/ghcr
+  repository: valkey-io/valkey-operator
+  tag: v0.5.0
+
+replicaCount: 1
+
+resources:
+  limits:
+    cpu: 500m
+    memory: 256Mi
+  requests:
+    cpu: 10m
+    memory: 64Mi

argocd/applicationsets/platform.yaml

@@ -43,6 +43,7 @@ spec:
       - path: apps/overlays/*/reloader-system
       - path: apps/overlays/*/reposync
       - path: apps/overlays/*/traefik-system
+      - path: apps/overlays/*/valkey-operator-system
       - path: apps/overlays/*/vm-system
       - path: apps/overlays/*/vpa-system
       - path: apps/overlays/*/vault