Hydra adds native arm64 Docker image builds for hydra-node

What happened

Hydra commit #2814 ungates the hydra-node image build for aarch64 and adds publishing of a native linux/arm64 image alongside linux/amd64. The change follows a reported test in which the emulated amd64 image on an M1 under Rosetta did not finish its KZG trusted-setup warm-up or reach Open.

For operators on Apple Silicon or arm64 Linux, the intended result is a native image path instead of one that can look like a silent hang: Docker may appear healthy and logs may remain empty while the process is compute-bound in emulated BLS12-381 work.

Why it matters

This is a practical delivery update for Hydra operators and builders using arm64 hardware. It addresses a packaging route that reportedly failed to start rather than merely starting slowly, while leaving Hydra’s protocol behavior unchanged.

The update also follows earlier attention to KZG warm-up tracing, but its new development is native arm64 image delivery rather than additional observability.

What to watch

The material receipt is a live, pullable arm64 image tag or manifest that operators can verify from the registry. Until then, the commit on master does not establish that the arm64 image has been published successfully.