Allow service port and type to be configurable

[abhi1693]

I run my k8s on openstack and it requires a service of type LoadBalancer or NodePort to be able to expose the app. Since the service type is hard-coded, I have to manually update the type after every upgrade. I also want to be able to change the port so that I can redirect traffic from port 80 -> 8000

[rubenfiszel]

You can pass PORT as env variable to override the app port

[abhi1693]

But that doesn't change the service kind type and the port. Since those are hard coded, only way is to edit the manifest after every upgrade