Build the app to a single native binary with graalpy's 'standalone
native' command (Dockerfile.native). granian/rloop cannot be bundled
into a standalone binary, so the executable serves the app over ASGI
with Hypercorn via native/entrypoint.py, which also works around
GraalPy standalone quirks (socket.listen, str response bodies, signal
handling).
Adds docker-compose.native.yml, a -native CI job, and README docs.
Multi-stage Dockerfile.graalpy on ghcr.io/graalvm/graalpy-community:25
that builds the granian and rloop PyO3 extensions from source against
GraalPy (no GraalPy wheels exist), installs the pure-Python deps, and
serves the unchanged RSGI app on the rloop event loop.
Adds docker-compose.graalpy.yml and a CI job publishing the image as
the *-graalpy tags on release/*.