Add support for WASM OCI image in spin #164
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This is a draft PR that demonstrates how OCI artifacts could be used with a runtime that requires a configuration file. It seems spin is dependent on a file system layout which this PR re-creates based on the current way spin works with OCI. There might be a better approach with some changes to spin. Opening it up as it has been a common question. Open to ideas to make things better!
This PR requires changes to spin (todo: links issues in spin), containerd/runwasi#147 and containerd/containerd#9142 (being backported to containerd 1.6 and 1.7) which have the oci artifact support.