Further openid work

lib/sso_bsn/interactive.ex

@@ -36,7 +36,8 @@ defmodule SsoBsn.Interactive do
           "client_secret_post",
           "client_secret_jwt",
           "private_key_jwt"
-        ]
+        ],
+        id_token_signature_alg: "RS256"
       }
       |> Map.merge(opts |> Enum.into(%{}))
     )