add copyright to script

Signed-off-by: Thibault Mange <[email protected]>

cicd-scripts/metrics/scripts/extract-dashboards-metrics.sh

@@ -1,4 +1,7 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
+# Copyright (c) 2021 Red Hat, Inc.
+# Copyright Contributors to the Open Cluster Management project
 
 set -e -o pipefail