Enhance CI workflow with OpenCSD decoder build steps

[vinodappu]

Added steps to build OpenCSD decoder and prepare artifacts.

[Copilot]

Pull request overview

This PR introduces a GitHub Actions CI workflow to automate the build process for the OpenCSD decoder library. The workflow is triggered on pushes and pull requests to the master branch, as well as manual/API triggers via workflow_dispatch. It builds the OpenCSD libraries and prepares them as artifacts for download.

Key Changes:

• Adds automated build for OpenCSD decoder libraries using the existing Linux makefile
• Prepares and uploads build artifacts for distribution
• Enables manual workflow triggering for external integrations

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The build creates versioned shared libraries (e.g., libopencsd.so.X.Y.Z and symlinks) along with static libraries (.a files), but the workflow only copies the base .so file. This could cause issues for proper library versioning and linking.

Consider using a wildcard or copying the entire directory to preserve all library variants and symlinks:

cp -d "$GITHUB_WORKSPACE/decoder/lib/builddir"/lib*.so* \
   "$GITHUB_WORKSPACE/artifacts/OpenCSD/"
cp "$GITHUB_WORKSPACE/decoder/lib/builddir"/lib*.a \
   "$GITHUB_WORKSPACE/artifacts/OpenCSD/" 2>/dev/null || true

The -d flag preserves symlinks, which is important for versioned shared libraries.

Suggested change

	# Copy the built library
	cp "$GITHUB_WORKSPACE/decoder/lib/builddir/libopencsd.so" \
	"$GITHUB_WORKSPACE/artifacts/OpenCSD/libopencsd.so"
	# Copy all built shared and static libraries, preserving symlinks
	cp -d "$GITHUB_WORKSPACE/decoder/lib/builddir"/lib*.so* \
	"$GITHUB_WORKSPACE/artifacts/OpenCSD/"
	cp "$GITHUB_WORKSPACE/decoder/lib/builddir"/lib*.a \
	"$GITHUB_WORKSPACE/artifacts/OpenCSD/" 2>/dev/null || true

[Copilot]

The build commands don't explicitly check for build failures. If make libs fails, the workflow will continue to the artifact preparation step, which could lead to confusing errors.

While GitHub Actions will automatically fail the step if the command exits with a non-zero status, it's better to be explicit. Consider adding error checking or using set -e to stop on any error:

run: |
  set -e  # Exit on any error
  cd "$GITHUB_WORKSPACE/decoder/build/linux"
  make libs

[Copilot]

The artifacts only include the compiled libraries but not the header files required to use them. Consumers of these libraries will need the headers from decoder/include/ to compile against the library.

Consider adding header files to the artifacts:

# Copy headers
cp -r "$GITHUB_WORKSPACE/decoder/include" \
   "$GITHUB_WORKSPACE/artifacts/OpenCSD/"

Suggested change

	# Copy headers
	cp -r "$GITHUB_WORKSPACE/decoder/include" \
	"$GITHUB_WORKSPACE/artifacts/OpenCSD/"