feat: add support for custom permissions in Helm chart rbac.yaml file (#10590)

Co-authored-by: Dean Sheather <dean@deansheather.com>
Co-authored-by: Atif Ali <atif@coder.com>

helm/libcoder/templates/_rbac.yaml

@@ -43,6 +43,9 @@ rules:
     - update
     - watch
 {{- end }}
+{{- with .Values.coder.serviceAccount.extraRules }}
+{{ toYaml . | nindent 2 }}
+{{- end }}
 ---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding