Add codebuild pipeline for eks-d

[jaxesn]

What would you like to be added:
Currently we do all builds via prow, pre and postsubmit. We should consider adding a codebuild pipeline similar to eks-anywhere to support additional build options.

Why is this needed:
To support internal customers who require builds of EKS-D

[markapruett]

@jaxesn What are the additional build options we're looking to support, or would this replace Prow with codebuild?

[markapruett]

Updated description to answer my question.

[markapruett]

Done as part of the Golang pipeline project.