This adds a new GitHub Actions workflow build-cli-nx.yml that builds
the CLI using Nx commands instead of npm scripts. Key differences:
- Uses `npx nx build cli --configuration=oss/bit` instead of npm run dist commands
- Simplified build matrix focusing on OSS/Bit configurations
- Runs build, test, and lint targets through Nx
- Working directory is repo root instead of apps/cli
- Removes platform-specific packaging (focusing on basic build verification)
This complements the existing build-cli.yml workflow and allows us to
validate that our Nx integration works in CI while keeping the existing
npm-based builds as the primary deployment mechanism.
The workflow validates both OSS and Bit configurations and ensures the
build output is functional by testing the CLI help command.
a2391a5bbc