The SDK support for publishing .net core apps as a single-file generates bundles with unique IDs every time. This behavior is by design, so that files from apps with different build configurations/versions do not get their extracted files mixed up.

However, in some circumstances, the user may want to re-generate bundles with the same ID for testing purposes. So add a facility to facilitate this behavior.

In this case, it is the user's responsibility to clean out extracted files before using the new build with the same ID -- otherwise files previously extracted will be reused.