Add Github action for building and publishing an image #300
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The action triggers on pushes to the
develop
branch. It builds a container image and pushes it to ghcr.io. Based largely on the example from Github's documentation [1].There used to be actions that, among other things, also built and published a similar kind of image. But those were removed in commit 69b20c8.
[1] https://docs.github.com/en/actions/publishing-packages/publishing-docker-images#publishing-images-to-github-packages
Here's a test run and the resulting image.