Add resource limit to machine learning

[Y0ngg4n]

It would be nice to limit the resources of the machine learning pod as it can stress the node on which it is running immensely.

[bo0tzz]

I considered adding resource requests/limit when I was building the chart, but I decided against it as people have wildly different resource availability and so choosing a 'default' isn't feasible. You can easily add them yourself though:

machine-learning:
  resources:
    limits:
      cpu: 500m
      memory: 1Gi