support --cache-image for optimizing build layers

here is the doc for cache image: https://buildpacks.io/docs/app-developer-guide/using-cache-image/

reuse image layers will save time in downloading node/jvm etc.

and since gitlab managed container registry and Image name, It could be default settings for auto build.

or just build and reuse cache only in v0.28.0: https://github.com/buildpacks/pack/pull/1477