feat: using keda scaling

devops/aws/chart/templates/hpa.yaml

-{{- template "common.hpa" (list . "os-notification.hpa") -}}
-{{- define "os-notification.hpa" -}}
-## Define overrides for the service HPA resource here
-{{- end -}}

devops/aws/chart/templates/scaledobject.yaml

+{{- template "common.scaledobject" (list . "os-notification.scaledobject") -}}
+{{- define "os-notification.scaledobject" -}}
+## Define overrides for the service's scaled object resource here
+{{- end -}}
\ No newline at end of file