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This looks promising:

> Automates ImageOptim, ImageAlpha, and JPEGmini for Mac to make batch optimisation of images part of your automated build process.

https://jamiemason.github.io/ImageOptim-CLI/

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> automated build process

> Mac

Why would anyone run a CI server on a Mac?

Perhaps it's just their preferred platform. If it weren't for the expense I'd probably prefer it over Windows at least. At any rate, the readme does link to this article[1] if macOS isn't your thang.

[1] https://addyosmani.com/blog/image-optimization-tools/

You need to if your product is a macOS or iOS/watchOS/tvOS app.

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