Use Amazon ECR Public Gallery as a pull-through cache

[felddy]

💡 Summary

Use base images from Amazon ECR Public Gallery instead of Docker Hub when possible.

Motivation and context

Docker rate limits are sever and growing more restrictive.

Implementation notes

Please provide details for implementation, such as:

See:

• https://github.com/felddy/foundryvtt-docker/blob/646856f295a4221ef5d1b7768d471112a47558f1/Dockerfile#L34
• https://docs.aws.amazon.com/AmazonECR/latest/userguide/pull-through-cache.html#pull-through-cache-considerations

Acceptance criteria

How do we know when this work is done?

• Base images are not pulled from Docker Hub directly.