This adds commented out ignore directives for the following GitHub
Actions:
- action/cache
- action/checkout
- action/setup-python
These should be uncommented downstream to ensure that updates to these
dependencies are pushed from pull requests made in the skeleton.
This will configure `dependabot` to scan Terraform configurations if they exist
in a repository. If a repository stores a Terraform configuration in a sub-
directory this configuration will need to be modified or an additional
configuration must be added if there still exists a Terraform configuration in
the root directory.
