Publish to Docker Hub

[jcapogna]

It's annoying and kinda limiting to need to authenticate with GitHub to use the Docker image for this. It would be nicer if it was published to Docker Hub instead.

[osamaaamer95]

It appears that GHCR now allows public access as mentioned in this press release.

Our users have asked for anonymous access for public container images, similar to how we enable anonymous access to public repositories of source code today. Anonymous access is available with GitHub Container Registry today,

So you can use this to use the image without requiring authentication:

docker pull ghcr.io/fullstorydev/relay-core/relay-core:v0.1.3