Motivation

• Provide a one-click/manual release workflow that builds the whisper-stream example binary for supported runners and publishes platform-specific artifacts to a GitHub Release.

Description

• Add a new workflow at .github/workflows/stream-release.yml that triggers via workflow_dispatch and accepts tag and optional prerelease inputs.
• Configure a build matrix for ubuntu-latest and macos-latest, install SDL2 per platform, run cmake with -DWHISPER_BUILD_EXAMPLES=ON -DWHISPER_SDL2=ON, and build the whisper-stream target.
• Package each built binary into dist/whisper-stream-${{ runner.os }}.tar.gz and upload them as artifacts using actions/upload-artifact@v4.
• Create a GitHub Release using softprops/action-gh-release@v2 with the provided tag and attach the packaged .tar.gz artifacts, with release notes generated automatically.

Testing

• Attempted to validate the workflow YAML with a local python YAML load (automated) which failed because the environment lacks PyYAML (so YAML validation was not completed).
• Repository checks performed (git status --short and committing the new file) succeeded and the workflow file was created and committed.

Codex Task