Once T314507 is implemented, we should make the latest Codex code available in beta labs behind a query string parameter. This would require:
- T314507, including a query string parameter to opt into using the local version of Codex
- Updating the Codex repo in beta labs as patches are merged, like we do for extensions
- Somehow running the Codex build process every time the Codex repo is updated
- Configuring beta labs to point to the local Codex clone, and to allow using it through a query string parameter