Support HerdDB in the standard docker image.

[mattisonchao]

Motivation

Now, The docker image starts PostGRE, and it is a waste of resources. So, we can to use HerdDB instead.

Some code link: https://github.com/apache/pulsar-manager/blob/73e4ae37cdab1d8f1f6c08fd5aaca91c612687b6/docker/startup.sh

[mattisonchao]

I'm current work on it.

[michaeljmarshall]

@mattisonchao - what do you think about making it configurable to skip the spawning of any database process in the docker image? Then, in the Pulsar Helm Chart, we could add configuration to make it possible to add the database as a container in the Pulsar Manager's pod. That allows for better visibility into processes that the pod is running and it would also make it the database a bit more configurable.

[mattisonchao]

@michaeljmarshall

Yes, That's exactly what I thought.

I think we can add herddb image in docker-compose and remove raw database logic from pulsar-manager to improve user experience and observability.

Am I understanding right?

[michaeljmarshall]

@mattisonchao - yes, that makes sense to me for docker-compose. Ideally, we will also make it configurable in the pulsar helm chart.