The Packer handler is used to execute Packer builds using Stackl.
Variables from Stackl are added to a config map and mounted in the Packer container. Secrets from Vault are read using an init container and templated to a JSON file. This file is then added to the Packer container.
stackl create instance --stack-application-template <sat_name> --stack-infrastructure-template <sit_name> <stack_instance_name>