FEATURE: List, revoke and reconnect associated accounts. Phase 1 (#6099)

Listing connections is supported for all built-in auth providers. Revoke and reconnect is currently only implemented for Facebook.

lib/auth/github_authenticator.rb

@@ -6,6 +6,15 @@ class Auth::GithubAuthenticator < Auth::Authenticator
     "github"
   end
 
+  def enabled?
+    SiteSetting.enable_github_logins
+  end
+
+  def description_for_user(user)
+    info = GithubUserInfo.find_by(user_id: user.id)
+    info&.screen_name || ""
+  end
+
   class GithubEmailChecker
     include ::HasErrors