Summary

Update all GitHub Actions CI workflows to work with the new submodule-based architecture. Build scripts are now thin wrappers that delegate to upstream, and the submodule must be checked out.

Tasks

• Add submodules: recursive to all actions/checkout steps
• Update native build jobs to use tools/build/build_native.sh wrapper
• Update PHP deps build jobs to use tools/build/build_php_deps.sh wrapper
• Update package build jobs — artifact paths now under upstream/prod/native/_build/
• Update test jobs — extension name is now opentelemetry_distro, not elastic_otel
• Update any hardcoded prod/ paths to upstream/prod/
• Update Snyk/security scan paths if they reference old prod/ code
• Verify release workflow generates correct package names and versions
• Test full CI pipeline end-to-end on a feature branch

Depends on

Phase 6 completed — old code removed, no path ambiguity.