Preflight Checklist

• I could not find a solution in the existing issues, docs, nor discussions
• I have joined the ZITADEL chat

Describe your problem

As defined in OIDC RFC, a provider using Dynamic Client Registration is recommended to expose registration_endpoint metadata. However we can't define it within the lib for a provider -- even if present in the codebase for the discovery:

Describe your ideal solution

Add support for registration_endpoint in

and the associated custom option like this or allow adding custom metadata in openid-configuration endpoint

Version

main

Environment

Self-hosted

Additional Context

Happy to raise a PR for it.