Pinning CI templates in boilerplates
Description
Currently CI templates point to master. Consider changing this to point to the major branch of the CD templates.
Breaking changes can then be made to the CI templates and major version incremented (I would suggest we do this quite freely).
The most ideal scenario would be the cookiecutter creation script pulling in the latest CI major version and setting this. This avoids the need for updating the boilerplate code whilst ensuring new projects start on the freshest CI template.