Add ARM64 support for Docker images

[Mnikley]

Thanks for the great repo :)

The official Docker images (lasuite/meet-backend and lasuite/meet-frontend) only support AMD64. Running Meet on ARM64 devices requires manually building images locally, which isn't practical for updates. Multi-architecture Docker images supporting both linux/amd64 and linux/arm64 therefore would be great.

Currently im building backend and frontend images using:

docker buildx build --platform linux/arm64 --load --target backend-production -t meet-backend:arm64 .
docker buildx build --platform linux/arm64 --load --target frontend-production -t meet-frontend:arm64 -f src/frontend/Dockerfile .

[Mnikley]

Opened a PR to add multi-architecture support: #952 (comment)

[lebaudantoine]

The CI has been updated to push ARM64 images. I'm closing the issue; feel free to reopen it.