Package detectors exposes functions to register and use container information extractors.

Process detects the OS of a layer, the packages it installs/removes, and then stores everything in the database.

Version (integer) represents the worker version.

ErrParentUnknown is the error that should be raised when a parent layer has yet to be processed for the current layer.

ErrUnsupported is the error that should be raised when an OS or package manager is not supported.

SupportedOS is the list of operating system names that the worker supports.