Where's the execution detail? He never tells you how the config file is going to be run. Again, the entire post is relative to the goal of getting a stable CI build. If your config file is filled with implementation details of that goal, you're being imperative.
It has nothing to do with "writing programs in your config file". The problem is that your config file is telling the runner how to reach the goal rather than what the goal is.
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Where's the execution detail? He never tells you how the config file is going to be run. Again, the entire post is relative to the goal of getting a stable CI build. If your config file is filled with implementation details of that goal, you're being imperative.
It has nothing to do with "writing programs in your config file". The problem is that your config file is telling the runner how to reach the goal rather than what the goal is.
The real-world alternative is a partial rewrite of your CI infra, which usually not feasible.