Fix helper webserver command

[lautaro79]

Summary & Motivation

Helm rendering has a breaking indentation, making Dagster incompatible with programmtic synthetization tools like cdk8s https://github.com/cdk8s-team/cdk8s/issues/1679

How I Tested These Changes

Create a values-valid.yaml

ingress:
  apiVersion: 'networking.k8s.io/v1/Ingress'
  enabled: true
  ingressClassName: nginx
  dagsterWebserver:
    host: '$hostname'

Execute helm template:

helm template . --values values-valid.yaml --debug > debug.yaml

With PR fix, indentation is probably rendered in deployment-webserver.yaml

[lautaro79]

@smackesey Please, can you take a look at this change?

I'm tagging you because you already reviewed this similar PR: https://github.com/dagster-io/dagster/pull/20126

Thanks in advance!