Phillip Webb 16e6bc89ed Create a new ImagePackager tools class
Pull functionality from `Repackager` into a new `Packager` base class
and develop a variant for Docker image creation. The new `ImagePackager`
class provides a general purpose way to construct jar entries without
being tied to an actual file. This will allow us to link it to a
buildpack and provide application content directly.

Closes gh-19834
2020-01-20 23:48:47 -08:00
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