Add Rio to faas-cli generate

Expected Behaviour

The following should generate a Rancher Rio Service definition:

faas-cli generate --api=services.rio.cattle.io

apiVersion: rio.cattle.io/v1
kind: Service
metadata:
  name: figlet
  namespace: default
spec:
  concurrency: 10
  cpus: "0"
  env:
  - name: a
    value: b
  image: functions/figlet:latest
  imagePullPolicy: IfNotPresent
  maxScale: 1
  minScale: 1
  ports:
  - port: 8080
    protocol: HTTP
    targetPort: 8080
  rollout: true
  rolloutIncrement: 5
  rolloutInterval: 5
  scale: 1
  weight: 100

Current Behaviour

We have OpenFaaS CRD and Knative Serving CRD in place. I'd like to see the Rio CRD there next.

Possible Solution

Copy the approach used for the current generation as per: https://github.com/openfaas/faas-cli/blob/master/commands/generate.go#L164

Set all default / minimum needed to get a service running.

• Install K8s somewhere
• Install Rio - https://github.com/rancher/rio
• Try kubectl apply for the sample YAML above
• Next update the faas-cli code to generate Service YAML

Start in commands/generate.go around line 164 and review the existing CRD generation approach. Install Kubernetes and Rio, then apply the sample YAML to verify the required Service fields. Done means faas-cli generate --api=services.rio.cattle.io produces the shown Rio Service definition.