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A crucial chapter.
I miss some introduction to what CI actually is and what is its role in today's modern development. Like some sales pitch why readers should care if they are strangers to the concept. Some mentions of team work in a contemporary working environment would be great 👌
What I noticed is that somewhere in the middle pace changes from quickly getting up to speed with Gitlab CI to tedious debugging.
I think it might use a refreshing perspective AFTER the debugging part to zoom out, sum up what was done, how this could've been avoided and how it works in a modern working environment. Being able to run all or as many tests as possible locally is great, but normally (my experience, so might be biased) ppl build things from the start to make sure that CI will pass.