ci: helm template --validate the cert-manager chart as well #2215
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To upgrade cert-manager, or to better understand what resources the helm chart will create, it made sense to render the Helm chart as well and validate it against a k8s cluster.
I need this setup as cert-manager interacts with Ingress resources. If cert-manager is only able to interact with v1beta1 and/or v1 Ingress resources if it has a certain version, we need to know about that while considering the upgrade of ingress-nginx and cert-manager. So, this relates to #2183 and #2182.