v0.1.7

Notable changes:

• add (experimental) Builder: oci-import support (#61)
  • see #61 (comment) for an example of the intended usage
    Directory: pointing to an "OCI Image Layout" and File: pointing to either a single-entry "OCI Image Index" or a single raw "OCI Content Descriptor" (in either case, pointing to a single per-architecture "OCI Image Manifest" object within the blobs/ directory)

(See https://github.com/docker-library/bashbrew/blob/v0.1.7/scripts/bashbrew-host-arch.sh for a useful script that can help determine the appropriate binary to download for a given environment dynamically.)