Add support for running proxy on hostNetwork

[paul-bormans]

Sometimes you want to expose ingress only to the edge of your Kubernetes cluster and not tie it to an (external) load-balancer. For this it's usefull to support running the proxy Deployment on the hostNetwork.

Add option to the chart values.yaml to set hostNetwork: true

This should render hostNetwork: true on the deployment/pod spec

[wasaga]

We apologize for the inconvenience, but the Helm chart for this project has become quite large due to the inclusion of many config options related to Kubernetes deployments. As an alternative, we recommend using Kustomize for installation, which allows for greater customization of Deployment manifests. Please see the following link for more information: https://www.pomerium.com/docs/deploying/k8s/install#advanced.