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so, what makes up the 19MB difference? (i assume it's not caused by the nix one being MUCH older :-)

couldn't you simply do a multi-stage docker-image (in the not-nix situation),where you just copy over the go binary into the final docker-image, and add the needed files?

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The 19 MB difference is alpine linux crud, musl and other base things in my custom docker base image.

In theory I could do the multi-stage docker approach to get an as-tiny-as-possible setup (and I actually do this: https://github.com/Xe/site/blob/master/Dockerfile) but that won't cover ca-certificates generically.

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