[porter/aks-nginx-ingress] Bundle install fails when specifying a Helm chart version

[lachie83]

Expected Behavior

Provide user-defined cert-manager and nginx-ingress Helm chart versions.

Actual Behavior

Bundle installation fails when you provide a different version (I only tried a higher version than the default values) of the cert-manager and nginx-ingress charts. I suspect we are not running a helm repo update which fetches the updated repo index.yaml files from the configured repos before running the helm install command.

Output from bundle container

$ az container logs -g resource-group -n cnab-azure-379bfa27-5741-4ac5-8382-5fc53838e96a
/cnab/app
executing install action from aks-nginx-ingress (bundle instance: aks-nginx-ingress)
Install nginx
Tiller version (v2.16.1) does not match client version (v2.14.3); downloading a compatible client.
/usr/local/bin/helm helm install --name nginx-ingress stable/nginx-ingress --namespace nginx-ingress --version 1.27.0 --replace --values nginx-ingress-values.yaml --set controller.replicaCount=2
Error: failed to download "stable/nginx-ingress" (hint: running `helm repo update` may help)
Error: exit status 1
Error: mixin execution failed: exit status 1

According to the stable repo this version is available

$ helm search nginx-ingress
NAME                	CHART VERSION	APP VERSION	DESCRIPTION
stable/nginx-ingress	1.27.0       	0.26.1     	An nginx Ingress controller that uses ConfigMap to store ...

Steps to Reproduce the Problem

1. Use the simple deployment
2. Specify helm chart version 1.27.0 for the nginx-ingress parameter
3. Check the logs of the bundle container