Create ingress examples

Hi, thanks for the helm chart!

I am having trouble getting the ingress right.

Ingress specification

When I try to set the ingress in the current specification as

  - host: rsw.example.org
    paths:
      - path: /

I see

Error: failed to create resource: Ingress.extensions "rstudio-rstudio-workbench" is invalid: [spec.rules[0].http.paths[0].path: Invalid value: "map[path:/]": must be an absolute path, spec.rules[0].http.paths[0].backend: Required value: port name or number is required]

If I don't specify paths I get an error. Maybe there could be a default for this option?

  - host: rsw.example.org
    paths: []

Edit: In the template

https://github.com/rstudio/helm/blob/8b2deeecf9ba5c7229786712c02745a3c1213d53/charts/rstudio-workbench/templates/ingress.yaml#L29-L31

I found that the rules category comes before host: - so wouldn't the specification need to look as follows?

ingress:
  enabled: true
  rules:
    - host: subdomain.example.org
      paths:
        - path: /

Though this one errors with

	│ Error: failed to create resource: Ingress.extensions "rstudio-rstudio-workbench" is invalid: spec: Invalid value: []networking.IngressRule(nil): either `backend` or `rules` must be specified

Guidance how to set the ingress properly would be highly appreciated!

pathType Option

Since k8s v1.18 it is common to also provide a pathType option in the ingress.
Would it be possible to adapt the template to support this?

See the gitea helm chart as an example.

So in the end I would like to write the following

ingress:
  enabled: true
  annotations: {}
  hosts:
    - host: rsw.example.com
      paths:
        - path: /
          pathType: Prefix

Start with charts/rstudio-workbench/templates/ingress.yaml at the referenced lines and compare the template's expected values with the Kubernetes Ingress specification. Verify the requested host, path, backend, and pathType examples against the chart, with working ingress configuration examples and supported pathType behavior as the completion criteria.