ssh-demo: Use KBS URI in demo

The offline_fs_kbc file needs to be updated to use a kbs-uri compatible name
for the key, and the container image has been regenerated to reference the
decryption key via kbs uri in it's annotation.

The image has two tags: encrypted and decrypted.

Fixes: #6604
Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>

demos/ssh-demo/aa-offline_fs_kbc-keys.json

@@ -1,3 +1,3 @@
 {
-  "key_id": "HUlOu8NWz8si11OZUzUJMnjiq/iZyHBJZMSD3BaqgMc="
+  "default/key/ssh-demo": "HUlOu8NWz8si11OZUzUJMnjiq/iZyHBJZMSD3BaqgMc="
 }

demos/ssh-demo/k8s-cc-ssh.yaml

@@ -24,5 +24,5 @@ spec:
       runtimeClassName: kata
       containers:
       - name: ccv0-ssh
-        image: docker.io/katadocker/ccv0-ssh
+        image: ghcr.io/confidential-containers/test-container:multi-arch-encrypted
         imagePullPolicy: Always