[codex] Add release publish workflow

[k82cn]

Summary

• Add a release-published GitHub Actions workflow for publishing Flame release artifacts.
• Publish flamepy, Rust crates, and Docker Hub images from the release tag.
• Validate release metadata and verify published package/image availability.

Required Secrets

• PYPI_API_TOKEN
• CARGO_REGISTRY_TOKEN
• DOCKERHUB_USERNAME
• DOCKERHUB_TOKEN

Verification

• Ruby YAML parse for .github/workflows/release-publish.yaml
• git diff --cached --check
• Local release metadata validation for v0.6.0
• Dockerfile existence checks
• cargo publish --help checked feature flag support

Note: actionlint is not installed locally, so full GitHub Actions semantic linting was not run.

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.