CockroachDB preset

[orlangure]

CockroachDB is another database that would be great to support.

I suggest to discuss the requirement here before starting the work.

[orlangure]

@dosco, since you have much more experience with it, could you help to define the scope of this task?

You are already familiar with Gnomock, and it would be great if you addressed the following points:

• is there a way to run the container with username/password set during docker run? Or maybe is it OK to just run the database with passwordless root user?
• is there a way to set an initial database name during docker run? For example in other databases you could set an environment variable, and the container would create the database on startup.
• you mentioned this db is postgres compatible; can go postgres driver be used to run queries against it?