fix(multus): pin master CNI to 05-cilium.conflist

Set multusMasterCNI to explicitly use 05-cilium.conflist instead of
auto-detecting the first available conflist at boot. This prevents a
race condition where multus picks 10-kube-ovn.conflist if it appears
before 05-cilium.conflist during node startup, bypassing the Cilium
CNI chain entirely.

Upstream issue: https://github.com/k8snetworkplumbingwg/multus-cni/issues/1499
Tracking issue: https://github.com/cozystack/cozystack/issues/2310

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

packages/system/multus/templates/multus-daemonset-thick.yml

@@ -119,6 +119,7 @@ data:
         "cniConfigDir": "/host/etc/cni/net.d",
         "multusAutoconfigDir": "/host/etc/cni/net.d",
         "multusConfigFile": "auto",
+        "multusMasterCNI": "05-cilium.conflist",
         "socketDir": "/host/run/multus/"
     }
 ---