add matrix application

base/apps/matrix.yaml

@@ -0,0 +1,16 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: matrix-stack
+spec:
+  project: default
+  sources:
+    - repoURL: oci://ghcr.io/element-hq/ess-helm/matrix-stack
+      targetRevision: 25.12.2
+      path: .
+  destination:
+    server: in-cluster
+    namespace: matrix
+  syncPolicy:
+    syncOptions:
+      - CreateNamespace=true