[Bug] rayStartParams is required at this moment.

[kevin85421]

Why are these changes needed?

(base) ➜  ray-cluster git:(fix-helm-chart) helm install raycluster .
Error: INSTALLATION FAILED: unable to build kubernetes objects from release manifest: error validating "": error validating data: ValidationError(RayCluster.spec.workerGroupSpecs[0]): missing required field "rayStartParams" in io.ray.v1alpha1.RayCluster.spec.workerGroupSpecs

Currently, rayStartParams is a required field now, so we need to use rayStartParams: {} if rayStartParams in values.yaml is empty.

Related issue number

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • This PR is not tested :(

# head
rayStartParams:
  dashboard-host: '0.0.0.0'
initArgs:
  111: 222

# path: helm-chart/ray-cluster/
helm template .

# worker
rayStartParams: {}
initArgs:
  111: 222

# path: helm-chart/ray-cluster/
helm template .