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Installer is a standard interface for objects which can "install" themselves an engine by registering handlers. This can be used as an entrypoint for external plugins etc. Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes) Upstream-commit: 4353f25e10d19f414bdd5b20488824fb2b834d6e Component: engine