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You can do this with cue/flow, but have not turned it into a full CI system. The building blocks are there

Never heard of cue/flow will definitely check it out

cue/flow is a Go package and what powers the scripting / custom tools part of CUE. It's built on top of the language and a graph resolver.

I have another custom flow implementation that I find more ergonomic: https://hofstadter.io/getting-started/task-engine/