Add container deployment github workflow and production image.

[hmacdope]

Fixes #61

• Changes the Dockerfile to mamba
• Adds a container deployment workflow. You can also make this tagged for releases only.

[greglandrum]

@hmacdope the changes here look ok to me. I will try doing the docker build myself to confirm that everything looks good when I'm back at a real computer.

A question and a suggestion:

1. The deploy_docker action you added looks like it needs credentials. Are we going to have to set that up somewhere?
2. Suggestion: I think it would help to have something in the README for the Dockerfile that shows a simple example or two of how to use the image once you've installed it.

[hmacdope]

@hmacdope the changes here look ok to me. I will try doing the docker build myself to confirm that everything looks good when I'm back at a real computer.

A question and a suggestion:

1. The deploy_docker action you added looks like it needs credentials. Are we going to have to set that up somewhere?

It does look like that, but no because the action runs with github permissions scoped to this repo it can publish packages scoped to this repo without credentials.

2. Suggestion: I think it would help to have something in the README for the Dockerfile that shows a simple example or two of how to use the image once you've installed it.

This is a good idea! Do you have any specific suggestions of what you would like to see? You are probably best placed to understand what is a good demo.