Docker Image builds should be automated

[cticenhour]

Based on the success of #153, we should have some sort of action to generate and upload the docker image on each push to master as well. Docker themselves seems to have made one that might be worth looking into: https://github.com/marketplace/actions/build-and-push-docker-images

My question right now is - how much can we use the current script we have to generate and upload the image? Or do we need to start from scratch? Making an issue to note thoughts and explorations...