[enhancement]: Publish Docker Images to a Container Registry

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Contact Details

_No response_

### What should this feature add?

On release, publish the built docker image to a publicly accessible container registry. This can be accomplished quite easily in a GitHub action and published to the GitHub container registry. Alternatively, There are some GitHub actions that make it easy to publish to Docker Hub with API keys as GitHub secrets.

### Alternatives

Currently, users have to clone this repository and build the images themselves, which is significantly more effort than just being able to `docker image pull ...`.

### Additional Content

Published images make it easier for people to just give InvokeAI a quick try with minimal effort.