Add ARM64 support for both dask and dask operator docker images

Hello,

I've been trying to implement this in a Kubernetes cluster in AWS, but I prefer to use Graviton (ARM64) instances due to its benefits and optimal cost. However, I've noticed that there are not images supporting this architecture.

I could also volunteer for doing it (if possible) but I'd need a bit of orientation for the CI building the images.

Thanks!