CodeBuild: Support LOCAL_DOCKER_LAYER_CACHE

[odanado]

By setting type as LOCAL and modes as LOCAL_DOCKER_LAYER_CACHE, CodeBuild can be cached Docker Image.
https://docs.aws.amazon.com/ja_jp/codebuild/latest/APIReference/API_ProjectCache.html

But, @aws-cdk/aws-codebuild@0.25.1 only can set type as S3.
https://github.com/awslabs/aws-cdk/blob/v0.25.1/packages/@aws-cdk/aws-codebuild/lib/project.ts#L606-L609

[rvdwijngaard]

+1

[SanderKnape]

I can look into implementing this feature, but would like some feedback on the how to do so first. As mentioned before there is currently a cacheBucket property (https://github.com/awslabs/aws-cdk/blob/master/packages/%40aws-cdk/aws-codebuild/lib/project.ts#L591) that will enable S3 caching. I can add a new property, cacheModes, that accepts a list of cache modes (see https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-codebuild-project-projectcache.html). Then I would also need to check if only one of cacheBucket or cacheModes is set. I guess I can do this around this other validation that is happening: https://github.com/awslabs/aws-cdk/blob/master/packages/%40aws-cdk/aws-codebuild/lib/project.ts#L658 This is backwards-compatible change.

Another option is to change the existing property to something new that would accept either S3 cache settings or a list of cache modes.

Any thoughts? Maybe @skinny85 ?