TLS documentation is not correct (or authorino not working as intended)

[OperationalDev]

Describe the bug
When running through the getting started tutorial using TLS, the authorino operator panics.

Help us Reproduce it
To reproduce follow the tutorial steps:

1. Install operator: kubectl apply -f https://raw.githubusercontent.com/Kuadrant/authorino-operator/main/config/deploy/manifests.yaml
2. Create namespace: kubectl create namespace authorino
3. Setup cert-manager: kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v1.4.0/cert-manager.yaml
4. Create certs: curl -sSL https://raw.githubusercontent.com/Kuadrant/authorino/main/deploy/certs.yaml | sed "s/$(AUTHORINO_INSTANCE)/authorino/g;s/$(NAMESPACE)/authorino/g" | kubectl -n authorino apply -f -
5. Deploy Authorino with TLS

kubectl -n authorino apply -f -<<EOF
apiVersion: operator.authorino.kuadrant.io/v1beta1
kind: Authorino
metadata:
  name: authorino
spec:
  image: quay.io/3scale/authorino:v0.5.0
  replicas: 1
  clusterWide: true
  listener:
    tls:
      certSecretRef:
        name: authorino-server-cert
  oidcServer:
    tls:
      certSecretRef:
        name: authorino-oidc-server-cert
EOF

Expected behavior
Authorino instance should be created.

Actual behavior
Operator panics.

[bob@workstation example]$ k logs -f deployment/authorino-operator-controller-manager -c manager -n authorino-operator
2022-04-06T11:35:18.332Z        INFO    controller-runtime.metrics      metrics server is starting to listen    {"addr": "127.0.0.1:8080"}
2022-04-06T11:35:18.334Z        INFO    setup   starting manager
I0406 11:35:18.334570       1 leaderelection.go:243] attempting to acquire leader lease authorino-operator/aac3a15d.authorino.kuadrant.io...
2022-04-06T11:35:18.334Z        INFO    controller-runtime.manager      starting metrics server {"path": "/metrics"}
I0406 11:35:33.776897       1 leaderelection.go:253] successfully acquired lease authorino-operator/aac3a15d.authorino.kuadrant.io
2022-04-06T11:35:33.776Z        DEBUG   controller-runtime.manager.events       Normal  {"object": {"kind":"ConfigMap","namespace":"authorino-operator","name":"aac3a15d.authorino.kuadrant.io","uid":"8dafc1e5-b6da-4c4b-b7fc-35cfadda7d59","apiVersion":"v1","resourceVersion":"36445045"}, "reason": "LeaderElection", "message": "authorino-operator-controller-manager-d4ccf5478-zxmmw_41a63594-323f-477d-9e52-e6490c5f7611 became leader"}
2022-04-06T11:35:33.777Z        DEBUG   controller-runtime.manager.events       Normal  {"object": {"kind":"Lease","namespace":"authorino-operator","name":"aac3a15d.authorino.kuadrant.io","uid":"beecf777-33bc-4cf1-81e8-f44256d46893","apiVersion":"coordination.k8s.io/v1","resourceVersion":"36445046"}, "reason": "LeaderElection", "message": "authorino-operator-controller-manager-d4ccf5478-zxmmw_41a63594-323f-477d-9e52-e6490c5f7611 became leader"}
2022-04-06T11:35:33.777Z        INFO    controller-runtime.manager.controller.authorino Starting EventSource    {"reconciler group": "operator.authorino.kuadrant.io", "reconciler kind": "Authorino", "source": "kind source: /, Kind="}
2022-04-06T11:35:33.777Z        INFO    controller-runtime.manager.controller.authorino Starting Controller     {"reconciler group": "operator.authorino.kuadrant.io", "reconciler kind": "Authorino"}
2022-04-06T11:35:33.877Z        INFO    controller-runtime.manager.controller.authorino Starting workers        {"reconciler group": "operator.authorino.kuadrant.io", "reconciler kind": "Authorino", "worker count": 1}
2022-04-06T11:35:33.877Z        DEBUG   authorino-operator.controller.Authorino Found an instance of authorino  {"authorino": "hello-world/authorino", "authorinoInstanceName": "authorino"}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x15040d9]

goroutine 257 [running]:
github.com/kuadrant/authorino-operator/controllers.(*AuthorinoReconciler).installationPreflightCheck(0xc0005808a0, 0xc0000ee000, 0x1e, 0xc000416a00)
        /workspace/controllers/authorino_controller.go:677 +0x239
github.com/kuadrant/authorino-operator/controllers.(*AuthorinoReconciler).Reconcile(0xc0005808a0, 0x1a05578, 0xc000514f30, 0xc000627b10, 0xb, 0xc000627af0, 0x9, 0xc000514f30, 0xc000030000, 0x16cd6c0, ...)
        /workspace/controllers/authorino_controller.go:100 +0x28b
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler(0xc000550b40, 0x1a054d0, 0xc0003dac00, 0x1693a20, 0xc000416980)
        /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.9.2/pkg/internal/controller/controller.go:298 +0x30d
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem(0xc000550b40, 0x1a054d0, 0xc0003dac00, 0xc0003c3700)
        /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.9.2/pkg/internal/controller/controller.go:253 +0x205
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2(0xc000626b50, 0xc000550b40, 0x1a054d0, 0xc0003dac00)
        /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.9.2/pkg/internal/controller/controller.go:214 +0x6b
created by sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2
        /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.9.2/pkg/internal/controller/controller.go:210 +0x425

Environment (please complete the following information):

• Cluster version: v1.23.1
• Authorino version: latest

Additional context
To fix this, I changed my config as follows:

kubectl -n authorino apply -f -<<EOF
apiVersion: operator.authorino.kuadrant.io/v1beta1
kind: Authorino
metadata:
  name: authorino
spec:
  image: quay.io/3scale/authorino:v0.5.0
  replicas: 1
  clusterWide: true
  listener:
    tls:
      enabled: true
      certSecretRef:
        name: authorino-server-cert
  oidcServer:
    tls:
      enabled: true
      certSecretRef:
        name: authorino-oidc-server-cert
EOF

[guicassolato]

Thanks for reporting this, @OperationalDev! I've sent a PR to fix in the docs.
It looks like we also need to do fix this for real in https://github.com/kuadrant/authorino-operator.