Apple M1 CPU support

As a user, I would like to run on M1 mac without this error

```bash
docker run --rm -it -v "$(pwd):/steg" rickdejager/stegseek finalClue.png
...
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
StegSeek 0.6 - https://github.com/RickdeJager/StegSeek
```