Adding the following accross the project:
```bash
/# exit immediately when a command fails
set -e
/# only exit with zero if all commands of the pipeline exit successfully
set -o pipefail
/# error on unset variables
+set -u
```
Without this access the logs of metrics-server will show the following error line:
```
unable to fully scrape metrics from source kubelet_summary:k8s-1: unable to fetch metrics from Kubelet k8s-1 (10.8.10.14): request failed - "403 Forbidden", response: "Forbidden (user=system:serviceaccount:kube-system:metrics-server, verb=get, resource=nodes, subresource=stats)",
```
and `kubectl top nodes` will give no results
