Use GitHub Container Registry instead of Docker Hub #44
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Docker Hub will remove access for free organization on 14. April, so that we need a new container registry for our Docker images. Therefor we want to use GitHub Container Registry in the future (ghcr.io).
This commit also removes the depreacted "set-output" command and replaces it with the recommended way from
https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/