* Use an init container to eliminate potential edge case where losing
the first pet's could cause it to start a second logical cluster
* Exec the cockroach binary so that it runs as PID 1 in the container
* Make some small improvements to the README
That was only included in the initial config due to cargo-culting, and
has the potential to break node startup if it resolves its own address
to gossip to.
Includes:
* A service for clients to use
* Readiness/liveness probes
* An extended graceful termination period
* Easy clean-up of all created resources
