ARM (M1) build

Would it be possible to add multi platform support to the docker image?

It should be (famous last words) nothing more than adding this config: https://github.com/GoogleContainerTools/jib/blob/master/docs/faq.md#how-do-i-specify-a-platform-in-the-manifest-list-or-oci-index-of-a-base-image

And probably the following in the GHA

```
- name: Set up QEMU
uses: docker/setup-qemu-action@v2

- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v2
```