In-house gems have nowhere to publish: gems locals only take raw file uploads, which `gem push`, `gem install` and bundler cannot use.
- accept `gem push` (`POST <repo>/api/v1/gems`, 256MiB cap, 8MiB metadata cap) and `gem yank` (`DELETE <repo>/api/v1/gems/yank`); any API key works
- parse the gemspec from the `.gem`; reject an existing name-version-platform with 409
- serve the compact index (`versions`, `info/<gem>`, `names`), `.gem` files and generated `quick/Marshal.4.8` specs; no legacy `specs.4.8.gz`
- route HEAD on locals (gem probes `versions` with HEAD)
- add `docs/gems/local.md`, a UI snippet and a stock `ruby:3.3` e2e-docker case
Reviewed-on: #153
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
unkin-agent