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"GitHub CI is easy", he said. "It's just bash ", he said.
(programming.dev)
Until he actually had to use it.
Took 2 hours of reading through examples just to deploy the site.
Turns out, it is hard to do even just the bash stuff when you can't see the container.
We test our code locally, but we cannot test the workflow. By definition, testing the workflow has to be done on a CI-like system.
There is nektos/act for running github actions locally, it works for simple cases. There still are many differences between act and github actions.
It might be possible for a CI to define workflow steps using Containerfile/Dockerfile. Such workflows would be reproducible locally.