Impossible to disable ServiceAccount

[mxk]

If serviceAccount.create is set to false, the deployment fails because the Pod spec still ends up with a serviceAccount: {{ template "fullname" . }} attribute. That should probably be conditional.

[zoomoid]

For pre-provisioned service accounts, this breaks the chart's functionality of adding service accounts to the deployment entirely, because in that case we don't want it to create a Service Account but also want to template in the name