More information on how CDK utilizes CodeBuild and CFN

[Waqiah]

Would it be possible to add a few points or links to how CodeBuild and CFN works under the hood of CDK.

For example, when following the steps in this doc to deploy codepipeline via CDK:
https://docs.aws.amazon.com/cdk/v2/guide/cdk_pipeline.html

The following error occurred: "Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running"
This error occurs at the CodeBuild phase to which after enabling PrivilegeMode helped resolved the issue, however in the doc nothing mentions the use of CodeBuild anywhere.

From personal experience, a CDK beginner was confused as to why CodeBuild was being used as they did not interact with the service directly.