Buildah scripts typically use shell. You can see an example of a script here,
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Let's say I have such a shell script that produces an image "myAlpineImage". How can I use GitHub CI to automate the creation of this image, and preferably uploading it to GitHub Container Registry?
What have you tried so far? As it stands, this question is very broad, and by narrowing down the scope to solving what you've tried thus far, you will be much more likely to get an accurate response. @PrestonMartin I self answered.