- Disable goreleaser GitHub release for nightly (Docker still pushed)
- Use GORELEASER_CURRENT_TAG with local-only tag for version/validation
- Force-update single `nightly` git tag instead of creating per-day tags
- Docker tags use only `nightly`/`nightly-launcher`, no per-day versions
- Set --latest=false on nightly release to avoid occupying latest
- Simplify workflow from 3 jobs to 1 job, remove all cleanup steps
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>