Write documentation on how to verify a release

[andygrove]

Is your feature request related to a problem or challenge? Please describe what you are trying to do. When we hold a vote on releasing Ballista, we need voters to know how to verify a release. There is a simple script that will simply run cargo test and check signatures, but that isn't sufficient for a distributed platform such as Ballista.

Describe the solution you'd like Write documentation on how to verify a release. This should at least involve spinning up a cluster using docker-compose and running one query.

We do have ./dev/integration-test.sh which seems to be broken currently (https://github.com/apache/arrow-ballista/issues/360), but we can probably fix that fairly easily.

Describe alternatives you've considered None

Additional context None