Publish official Docker images as part of release process

[andygrove]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
When we release DataFusion and Ballista we should publish Docker images to the Apache Docker Hub repo for the following:

• DataFusion CLI
• Ballista Scheduler + Executor

Describe the solution you'd like
We should see how Apache Airflow does this.

Describe alternatives you've considered
Alternative is relying on users to build and publish their own Docker images, as Apache Spark does.

Additional context
None

[jorgecarleitao]

Excellent idea.

[andygrove]

@houqp Are you familiar with how Airflow publishes Docker images?

[houqp]

@andygrove they are built and pushed manually to dockerhub during the release process as convenient packages, not as part of the official release, see https://github.com/apache/airflow/tree/32bfb2f8ad3ac7314a2f6ff5e59567914b07a2b6/dev#apache-airflow-package. This means they don't have to vote on the docker image.

I think we could adopt the same pattern for ballista since we are still in early development phase.