fix(scripts): warn about the vars dependency (#568)

When rendering the secrets, e.g., config template, via script, we run
some parts of the playbooks that may depend on the variables for a
deployment (like MP+ vs Automotive, and such). Warn about this fact to
make sure there are no discrepancies introduced by outdated “secrets”.

scripts/render_secrets_from_templates.sh

@@ -17,3 +17,5 @@ ansible-playbook -v -c local -i localhost, \
                  -e path_to_secrets="$(realpath "${PATH_TO_SECRETS}")" \
                  -e service="${SERVICE}" \
                  playbooks/render_secrets_from_templates.yml
+
+echo "[WARNING] Please make sure your ‹vars/› are up-to-date, since the rendered secrets may depend on it."