🐞 sslip.io: fix key-value store for GCE

We set the number of replicas to 1 so that when you create a key-value
on `ns-gce.sslip.io`, you're sure of retrieving that value later from
`ns-gce.sslip.io`.

Previously it could hit the other replica, which would have a different
key-value store, which would make the value "disappear".

k8s/sslip.io.yml

@@ -4,7 +4,7 @@ kind: Deployment
 metadata:
   name: sslip.io
 spec:
-  replicas: 2
+  replicas: 1
   selector:
     matchLabels:
       app: sslip.io-dns