Enable publishing to ghcr.io (Github container registry) #2215
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Dockerhub got unfortunately rate limited regarding pulling containers.
By publishing to the Github container registry (can be found here https://github.com/koalaman?tab=packages) that rate limit can be avoided and makes pipelines using shellcheck via Docker more reliable.
Merging this requires adding a token called GITHUB_GHCR_TOKEN (with the capability to push containers) to the repo secrets.