exit on error

gitlab/prepare.sh

 #!/usr/bin/env bash
+set -e
 service_name="$1"
 . ./gitlab/configure_git.sh
 # git clone --depth 1 https://$service_name:${GIT_ACCESS_TOKEN}@code.schleswig-holstein.de/ozg-cloud/devops/build-management.git ## TODO: use this when MR is merged