WIP check that a mismatching secret is not ignored

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

docker-compose-gitlab.yaml

@@ -24,7 +24,7 @@ services:
               'uid_field' => 'preferred_username',
               'client_options' => {
                 'identifier' => 'authz-mediator',
-                'secret' => 's3kr3t',
+                'secret' => 'this-should-fail',
                 'redirect_uri' => 'http://mediator:5555/callback',
                 'authorization_endpoint' => 'http://mediator:5555/auth',
                 'token_endpoint' => 'http://mediator:5555/token',