Include multi-architecture docker image generation in docker-publish.yml

[imadreamerboy]

Add multi-architecture docker image generation including arm64 to docker-publish.yml.

• Add docker/setup-qemu-action@v2 to set up QEMU for emulating different CPU architectures.
• Add docker/setup-buildx-action@v2 to set up Docker Buildx for multi-architecture builds.
• Specify platforms: linux/amd64,linux/arm64 in the docker/build-push-action@v6 step to include arm64 architecture.

---

For more details, open the Copilot Workspace session.