in the containerized installer, currently the bundle_dir variable must be set when bundle_install = true. rather than requiring the customer to add this variable, the common role defaults could be updated with the following:

$ head containerized_installer/roles/common/defaults/main.yml
---
bundle_install: false
bundle_dir: '{{ playbook_dir }}/../../../../../bundle/'

the value of playbook_dir will always be underneath the installer top-level directory in the setup bundle, which is what makes this feasible.