Gate creation of ServiceAccount resource on .Values.manager.serviceAccount.create

Fixes #665

Author: bcrisp4

charts/k6-operator/templates/serviceAccount.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.manager.serviceAccount.create }}
 apiVersion: v1
 kind: ServiceAccount
 metadata:
@@ -9,3 +10,4 @@ metadata:
     {{- include "k6-operator.customLabels" . | default "" | nindent 4 }}
   annotations:
     {{- include "k6-operator.customAnnotations" . | default "" | nindent 4 }}
+{{- end }}