Use interval in ServiceMonitor endpoint

Reintroduce updated dpeloy.sh & teardown.sh

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

```

[1] https://github.com/koalaman/shellcheck

Make certgen work on OSX