h-a: Prefer running on a Raspberry Pi

Now that we have Raspberry Pi CM4 worker nodes, let's configure Home
Assistant to run on one, since it's pretty much designed to.

home-assistant/home-assistant.yaml

@@ -52,6 +52,16 @@ spec:
         app.kubernetes.io/name: home-assistant
         app.kubernetes.io/part-of: home-assistant
     spec:
+      affinity:
+        nodeAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            preference:
+              matchExpressions:
+              - key: kubernetes.io/arch
+                operator: In
+                values:
+                - arm64
       containers:
       - name: home-assistant
         image: ghcr.io/home-assistant/home-assistant:2023.10.3