Build & push ARM images to Docker Hub

To be able run `playpauseandstop/docker-python` natively at Mac M1/M2/M3 without following error,

```
❯ docker run -it --rm playpauseandstop/docker-python:7.0.0-py312 bash
Unable to find image 'playpauseandstop/docker-python:7.0.0-py312' locally
7.0.0-py312: Pulling from playpauseandstop/docker-python
docker: no matching manifest for linux/arm64/v8 in the manifest list entries.
```