base nix on ubuntu, no nix-shell for prod image, prod-image 1.47GB #100
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the production docker image doen't use the nix-shell anymore. We only need the packages without env variables, since nothing needs to be compiled. We also base it on ubuntu, because it is a smaller base system (~25MB) than the nix image was (~200MB). nix garbage collection helps to reduce the nix-store even more.
This brings the production docker-image down from 2.01GB to 1.47GB (save 0.54GB).
No more
/bin/sh
is needed in the production shell, since we're not using a nix-shell anymore.