(1/3) Just looked over AWS's new persistent Docker build servers. Looks like the main advantage is that you can cache all your layers without having to rebuild them all the time, saving a lot of build time.
https://aws.amazon.com/blogs/aws/accelerate-ci-cd-pipelines-with-the-new-aws-codebuild-docker-server-capability/
https://aws.amazon.com/blogs/aws/accelerate-ci-cd-pipelines-with-the-new-aws-codebuild-docker-server-capability/
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https://aws.amazon.com/codebuild/pricing/