Add ability to specify annotations for the SDK service account (#2317)

The gameserver SDK account commonly wants annotations, e.g. for cloud
file store permissions for logs. This adds the ability to map
gameserver namespaces to maps of annotations to be added to the SDK
account for the specified namespace.

Co-authored-by: Robert Bailey <robertbailey@google.com>

install/helm/agones/templates/serviceaccounts/sdk.yaml

@@ -23,6 +23,10 @@ metadata:
     chart: {{ template "agones.chart" $ }}
     release: {{ $.Release.Name }}
     heritage: {{ $.Release.Service }}
+{{- if hasKey $.Values.agones.serviceaccount.sdk.annotations . }}
+  annotations:
+{{- get $.Values.agones.serviceaccount.sdk.annotations . | toYaml | nindent 4 }}
+{{- end }}
 ---
 {{- end }}
 {{- if .Values.agones.rbacEnabled }}

install/helm/agones/values.yaml

@@ -38,6 +38,7 @@ agones:
       annotations: {}
     sdk:
       name: agones-sdk
+      annotations: {}
   createPriorityClass: true
   priorityClassName: agones-system
   controller:

site/content/en/docs/Installation/Install Agones/helm.md

@@ -197,6 +197,7 @@ The following tables lists the configurable parameters of the Agones chart and t
 
 | Parameter                                           | Description                                                                                     | Default                |
 | --------------------------------------------------- | ----------------------------------------------------------------------------------------------- | ---------------------- |
+| `agones.serviceaccount.sdk.annotations`             | A map of namespaces to maps of [Annotations][annotations] added to the Agones SDK service account for the specified namespaces | `{}`                   |
 |                       |                           |                            |
 {{% /feature %}}