Install knative and WASMEdge on OpenShift

WIP - This is a first draft and NOT had a clean cluster validation.

1. Follow the excellent OpenShift documentation to install OpenShift Serverless which is based on knative. Ensure that you also install the knative-serving service into the knative-serving project

   https://docs.openshift.com/container-platform/4.11/serverless/install/install-serverless-operator.html

2. Patch the knative service to allow for the crun runtime to be specified as an attribute in the service.

   oc patch configmap/config-features -n knative-serving --type merge --patch '{"data":{"kubernetes.podspec-runtimeclassname":"enabled"}}'
   

3. As the deployer configures the node it needs to run with elevated privaliges. We should create a dedicated project for it and apply labels to minimise the warnings returned.

   oc new-project knawd
   oc label --overwrite ns knawd   pod-security.kubernetes.io/enforce=privileged   pod-security.kubernetes.io/enforce-version=v1.24
   oc label --overwrite ns knawd   pod-security.kubernetes.io/audit=privileged   pod-security.kubernetes.io/enforce-version=v1.24
   oc label --overwrite ns knawd   pod-security.kubernetes.io/warn=privileged   pod-security.kubernetes.io/enforce-version=v1.24
   

   This should be part of the helm package in later releases.

4. Now run install the project into the knawd on the cluster

   git clone https://github.com/uirlis/wasi-crun-deployer
   cd wasi-crun-deployer/charts/wasi-crun-deployer
   helm install wasi-crun-deployer . --namespace knawd -f rhel8-values.yaml --set job.autoRestart=true
   

5. Finally run the sample helloworld service to validate the installation.

   git clone https://github.com/uirlis/helloworld-rust-wasi
   cd helloworld-rust-wasi
   kubectl apply -f service.yaml