[ADD] ending / for issuer required by LLNG v2

templates/gitlab.rb.j2

@@ -40,7 +40,7 @@ gitlab_rails['omniauth_providers'] = [
     "name" => 'openid_connect',
     "args" => {
       'name' => 'openid_connect',
-      'issuer' => 'https://{{ sso_url }}',
+      'issuer' => 'https://{{ sso_url }}/',
       'scope' => ['openid', 'profile', 'email'],
       'response_type' => 'code',
       'client_auth_method' => 'client_secret_post',