Imports of package registry

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
github.com/containerd/containerd/remotes
github.com/containerd/containerd/remotes/docker
github.com/moby/buildkit/cache/remotecache
github.com/moby/buildkit/session
github.com/moby/buildkit/session/auth
github.com/moby/buildkit/util/contentutil
github.com/moby/buildkit/util/resolver
github.com/opencontainers/image-spec/specs-go/v1
github.com/pkg/errorsPackage errors provides simple error handling primitives.
timePackage time provides functionality for measuring and displaying time.