Merge branch '39495-fix-bitbucket-login' into 'master'

Fix bitbucket login

Closes #39495

See merge request gitlab-org/gitlab-ce!15051

changelogs/unreleased/39495-fix-bitbucket-login.yml

+---
+title: Fix bitbucket login
+merge_request: 15051
+author:
+type: fixed

lib/omni_auth/strategies/bitbucket.rb

@@ -36,6 +36,10 @@ module OmniAuth
         email_response = access_token.get('api/2.0/user/emails').parsed
         @emails ||= email_response && email_response['values'] || nil
       end
+
+      def callback_url
+        options[:redirect_uri] || (full_host + script_name + callback_path)
+      end
     end
   end
 end