0.12.0 adds support for running sidecar containers in the M3DB pods and ensures
clusters created by the operator use 1.0 M3DB configs by default.
Breaking Changes
0.12.0 updates the default configuration file for M3DB. This is a breaking
change as the operator will not be able to create a working default
configuration file for pre-v1.0.0 deployments of M3DB. To use the new version
of the operator with an older version of m3db you will have to provide a custom
ConfigMap.