Publish wasi-demo-app as a package

[codefromthecrypt]

The image used for testing needs to be built from source https://github.com/containerd/runwasi/tree/main/crates/wasi-demo-app

It would be more convenient to access this as a package, especially as it clarifies what the ultimate OCI json are in use. e.g. to ghcr.io/containerd/runwasi/wasi-demo-app:latest

[rumpl]

The source code is in this repo: https://github.com/containerd/runwasi/tree/main/crates/wasi-demo-app

I think that the readme should be updated because after a make load the image that's loaded has the name ghcr.io/containerd/runwasi/wasi-demo-app:latest

Note: the wasmtest image doesn't exist in Docker hub, docker.io/library is the default prefix added when an image name doesn't contain the registry name/namespace.

[codefromthecrypt]

ok how about if I rename this to publish as a package? e.g. to ghcr.io/containerd/runwasi/wasi-demo-app:latest