application/vnd.ocipkg.v1.artifact as OCI Artifact

[termoshtt]

Split from #108

This PR introduces three media types, application/vnd.ocipkg.v1.{artifact,config+json,layer.tar+gzip}:

• application/vnd.ocipkg.v1.artifact is set as artifactType in OCI Image Manifest. Manifest with this type must satisfying followings:
  • config must be application/vnd.ocipkg.v1.config+json. This is a map from the digest of layer to file path list contained the layer like:

    {
      "layers": {
        "sha256:9b56444eec38adba2fbf7381ed832de98489045c6b322e36388b8ba29ebac595": [
          "test/Dockerfile",
          "test/fixture.sh"
        ]
      }
    }

  • layers must be a list of descriptors with application/vnd.ocipkg.v1.layer.tar+gzip media type